Bit more doc for process filter and sentinel changes

* src/process.c (Finternal_default_process_filter)
(Finternal_default_process_sentinel): Doc tweaks.

* doc/lispref/processes.texi: Typo fixes.

* etc/NEWS: Related markup.

doc/lispref/processes.texi

@@ -112,7 +112,7 @@ described below.
 argument that specifies where the standard output from the program will
 go.  It should be a buffer or a buffer name; if it is a buffer name,
 that will create the buffer if it does not already exist.  It can also
-be @code{nil}, which says to discard the output unless a custom filter function
+be @code{nil}, which says to discard the output, unless a custom filter function
 handles it.  (@xref{Filter Functions}, and @ref{Read and Print}.)
 Normally, you should avoid having multiple processes send output to the
 same buffer because their output would be intermixed randomly.
@@ -1189,7 +1189,7 @@ be sent to the process, but this is not built into Emacs Lisp.
 
   By default, process output is inserted in the associated buffer.
 (You can change this by defining a custom filter function,
-@pxref{Filter Functions}).  The position to insert the output is
+@pxref{Filter Functions}.)  The position to insert the output is
 determined by the @code{process-mark}, which is then updated to point
 to the end of the text just inserted.  Usually, but not always, the
 @code{process-mark} is at the end of the buffer.
@@ -1453,7 +1453,6 @@ code conversion and the end of line conversion---that is, one like
 @c set-process-filter-multibyte and process-filter-multibyte-p,
 @cindex filter multibyte flag, of process
 @cindex process filter multibyte flag
-@c FIXME there is always a filter function now
   When Emacs calls a process filter function, it provides the process
 output as a multibyte string or as a unibyte string according to the
 process's filter coding system.  Emacs

etc/NEWS

@@ -1093,6 +1093,7 @@ errors.  You should either convert them to utf-8 or add an explicit
 It used to disable the minor mode, major mode, and text-property keymaps,
 whereas now it simply has higher precedence.
 
++++
 ** Default process filters and sentinels are not nil any more.
 Instead they default to a function that does what the nil value used to do.
 

src/ChangeLog

+2014-02-22  Glenn Morris  <rgm@gnu.org>
+
+	* process.c (Finternal_default_process_filter)
+	(Finternal_default_process_sentinel): Doc tweaks.
+
 2014-02-21  Glenn Morris  <rgm@gnu.org>
 
 	* process.c (Fprocess_buffer, Faccept_process_output)

src/process.c

@@ -5188,7 +5188,8 @@ read_and_dispose_of_process_output (struct Lisp_Process *p, char *chars,
 DEFUN ("internal-default-process-filter", Finternal_default_process_filter,
        Sinternal_default_process_filter, 2, 2, 0,
        doc: /* Function used as default process filter.
-This inserts the process's output into its buffer.  */)
+This inserts the process's output into its buffer, if there is one.
+Otherwise it discards the output.  */)
   (Lisp_Object proc, Lisp_Object text)
 {
   struct Lisp_Process *p;
@@ -6413,7 +6414,7 @@ status_notify (struct Lisp_Process *deleting_process)
 DEFUN ("internal-default-process-sentinel", Finternal_default_process_sentinel,
        Sinternal_default_process_sentinel, 2, 2, 0,
        doc: /* Function used as default sentinel for processes.
-This inserts a status message into the process's buffer.  */)
+This inserts a status message into the process's buffer, if there is one.  */)
      (Lisp_Object proc, Lisp_Object msg)
 {
   Lisp_Object buffer, symbol;