lisp/international/mule.el (define-coding-system): Fix typos in the doc string.

Add missing ChangeLog entry for the previous commit.

Backported from trunk; do not merge back.

(cherry picked from commit 79e2dade)

lisp/ChangeLog

+2014-12-28  Eli Zaretskii  <eliz@gnu.org>
+
+	* international/mule.el (define-coding-system): Fix typos in the
+	doc string.
+
+2014-12-28  Kenichi Handa  <handa@gnu.org>
+
+	* international/mule.el (define-coding-system): Improve the doc
+	string.
+
 2014-12-27  Fabián Ezequiel Gallina  <fgallina@gnu.org>
 	* progmodes/python.el (python-shell-buffer-substring): Handle

lisp/international/mule.el

@@ -599,21 +599,22 @@ opposite of decoding).
 
 The decoding is done by at most 3 steps; the first is to convert
 a byte sequence to a character sequence by one of Emacs'
-internal routines specified by :coding-type attribute.  The
+internal routines specified by `:coding-type' attribute.  The
 optional second step is to convert the character sequence (the
 result of the first step) by a translation table specified
-by :decode-translation-table attribute.  The optional third step
-is to convert the above reslut by a Lisp function specified
-by :post-read-conversion attribute.
-
-The encoding is done by at most 3 steps which are reverse of the
-decoding steps.  The optional first step converts a character
-sequence to another character sequence by a Lisp function
-specified by :pre-write-conversion attribute.  The optional
-second step converts the above result by a translation table
-specified by :encode-translation-table attribute..  The third
-step converts the abobe result to a byte sequence by one of
-Emacs' internal routines specified by :coding-type attribute.
+by `:decode-translation-table' attribute.  The optional third step
+is to convert the above result by a Lisp function specified
+by `:post-read-conversion' attribute.
+
+The encoding is done by at most 3 steps, which are the reverse
+of the decoding steps.  The optional first step converts a
+character sequence to another character sequence by a Lisp
+function specified by `:pre-write-conversion' attribute.  The
+optional second step converts the above result by a translation
+table specified by `:encode-translation-table' attribute.  The
+third step converts the above result to a byte sequence by one
+of the Emacs's internal routines specified by the `:coding-type'
+attribute.
 
 The following attributes have special meanings.  Those labeled as
 \"(required)\" should not be omitted.
@@ -629,53 +630,52 @@ decodes and encodes to.  It must be one of `charset', `utf-8',
 `utf-16', `iso-2022', `emacs-mule', `shift-jis', `ccl',
 `raw-text', `undecided'.
 
-If VALUE is `charset', the coding system is for handling a byte
-sequence in which each byte or each two to four bytes sequence
-represents a character code of a charset specified
-by :charset-list attribute.
+If VALUE is `charset', the coding system is for handling a
+byte sequence in which each byte or every two- to four-byte
+sequence represents a character code of a charset specified
+by the `:charset-list' attribute.
 
 If VALUE is `utf-8', the coding system is for handling Unicode
-UTF-8 byte sequence.  See also the documentation of the
-attribute :bom.
+UTF-8 byte sequences.  See also the documentation of the
+attribute `:bom'.
 
 If VALUE is `utf-16', the coding system is for handling Unicode
-UTF-16 byte sequence.  See also the documentation of the
-attributes :bom and :endian.
+UTF-16 byte sequences.  See also the documentation of the
+attributes :bom and `:endian'.
 
-If VALUE is `iso-2022', the coding system is for handling a byte
-sequence conforming to ISO/IEC 2022.  See also the documentation
-of the attributes :charset-list, :flags, and :designation.
+If VALUE is `iso-2022', the coding system is for handling byte
+sequences conforming to ISO/IEC 2022.  See also the documentation
+of the attributes `:charset-list', `:flags', and `:designation'.
 
-If VALUE is `emacs-mule', the coding system is for handling a
-byte sequence which Emacs 20 and 21 used for internal character
-representations.
+If VALUE is `emacs-mule', the coding system is for handling
+byte sequences which Emacs 20 and 21 used for their internal
+representation of characters.
 
-If VALUE is `shift-jis', the coding system is for handling a byte
-sequence of Shift_JIS format.  See also the
-attribute :charset-list.
+If VALUE is `shift-jis', the coding system is for handling byte
+sequences of Shift_JIS format.  See also the attribute `:charset-list'.
 
-If VALUE is `ccl', the coding system uses CCL programs to decodes
-and encodes to a byte sequence.  The CCL programs must be
-specified by the attributes :ccl-decoder and :ccl-encoder.
+If VALUE is `ccl', the coding system uses CCL programs to decode
+and encode byte sequences.  The CCL programs must be
+specified by the attributes `:ccl-decoder' and `:ccl-encoder'.
 
-If VALUE is `raw-text', the coding system decodes a byte sequence
-as is.
+If VALUE is `raw-text', the coding system decodes byte sequences
+without any conversions.
 
 `:eol-type'
 
 VALUE is the EOL (end-of-line) format of the coding system.  It must be
 one of `unix', `dos', `mac'.  The symbol `unix' means Unix-like EOL
-\(i.e. single LF), `dos' means DOS-like EOL \(i.e. sequence of CR LF),
-and `mac' means Mac-like EOL \(i.e. single CR).  If omitted, Emacs
-detects the EOL format automatically when decoding.
+\(i.e. a single LF character), `dos' means DOS-like EOL \(i.e. a sequence
+of CR followed by LF), and `mac' means Mac-like EOL \(i.e. a single CR).
+If omitted, Emacs detects the EOL format automatically when decoding.
 
-`:charset-list' (required if :coding-type is `charset' or `shift-jis')
+`:charset-list' (required if `:coding-type' is `charset' or `shift-jis')
 
 VALUE must be a list of charsets supported by the coding system.
 
-If `coding-type:' is `charset', on decoding and encoding by the
+If `coding-type:' is `charset', then on decoding and encoding by the
 coding system, if a character belongs to multiple charsets in the
-list, a charset that comes earlier in the list is selected.
+list, a charset that comes first in the list is selected.
 
 If `:coding-type' is `iso-2022', VALUE may be `iso-2022', which
 indicates that the coding system supports all ISO-2022 based
@@ -685,7 +685,7 @@ If `:coding-type' is `shift-jis', VALUE must be a list of three
 to four charsets supported by Shift_JIS encoding scheme.  The
 first charset (one dimension) is for code space 0x00..0x7F, the
 second (one dimension) for 0xA1..0xDF, the third (two dimension)
-for 0x8140..0xEFFC, the optional fourth (thw dimension) for
+for 0x8140..0xEFFC, the optional fourth (three dimension) for
 0xF040..0xFCFC.
 
 If `:coding-type' is `emacs-mule', VALUE may be `emacs-mule',
@@ -711,9 +711,9 @@ VALUE must be a translation table to use on encoding.
 VALUE must be a function to call after some text is inserted and
 decoded by the coding system itself and before any functions in
 `after-insert-functions' are called.  This function is passed one
-argument; the number of characters in the text to convert, with
+argument: the number of characters in the text to convert, with
 point at the start of the text.  The function should leave point
-the same, and return the new character count.
+unchanged, and should return the new character count.
 
 `:pre-write-conversion'
 
@@ -742,7 +742,7 @@ to lower case.
 `:mime-text-unsuitable'
 
 VALUE non-nil means the `:mime-charset' property names a charset which
-is unsuitable for the top-level media type \"text\".
+is unsuitable for the top-level media of type \"text\".
 
 `:flags'
 
@@ -772,8 +772,8 @@ This attribute is meaningful only when `:coding-type' is `iso-2022'.
 
 `:bom'
 
-This attributes specifies whether the coding system uses a `byte order
-mark'.  VALUE must be nil, t, or cons of coding systems whose
+This attributes specifies whether the coding system uses a \"byte order
+mark\".  VALUE must be nil, t, or a cons cell of coding systems whose
 `:coding-type' is `utf-16' or `utf-8'.
 
 If the value is nil, on decoding, don't treat the first two-byte as
@@ -782,9 +782,9 @@ BOM, and on encoding, don't produce BOM bytes.
 If the value is t, on decoding, skip the first two-byte as BOM, and on
 encoding, produce BOM bytes according to the value of `:endian'.
 
-If the value is cons, on decoding, check the first two-byte.  If they
-are 0xFE 0xFF, use the car part coding system of the value.  If they
-are 0xFF 0xFE, use the cdr part coding system of the value.
+If the value is a cons cell, on decoding, check the first two bytes.
+If they are 0xFE 0xFF, use the car part coding system of the value.
+If they are 0xFF 0xFE, use the cdr part coding system of the value.
 Otherwise, treat them as bytes for a normal character.  On encoding,
 produce BOM bytes according to the value of `:endian'.
 
@@ -801,14 +801,14 @@ This attribute is meaningful only when `:coding-type' is `utf-16'.
 `:ccl-decoder' (required if :coding-type is `ccl')
 
 VALUE is a CCL program name defined by `define-ccl-program'.  The
-the CCL program reads a byte sequence and writes a character
-sequence as a decoding result.
+CCL program reads a byte sequence and writes a character sequence
+as a decoding result.
 
 `:ccl-encoder' (required if :coding-type is `ccl')
 
 VALUE is a CCL program name defined by `define-ccl-program'.  The
-the CCL program reads a character sequence and writes a byte
-sequence as a encoding result.
+CCL program reads a character sequence and writes a byte sequence
+as an encoding result.
 
 `:inhibit-null-byte-detection'