(comint-check-proc, make-comint-in-buffer, comint-source-default): Doc fixes.

(comint-mode, comint-snapshot-last-prompt): Fix typos in docstring.

lisp/comint.el

@@ -583,7 +583,7 @@ Return not at end copies rest of line to end and sends it.
 Setting variable `comint-eol-on-send' means jump to the end of the line
 before submitting new input.
 
-This mode is customised to create major modes such as Inferior Lisp
+This mode is customized to create major modes such as Inferior Lisp
 mode, Shell mode, etc.  This can be done by setting the hooks
 `comint-input-filter-functions', `comint-input-filter', `comint-input-sender'
 and `comint-get-old-input' to appropriate functions, and the variable
@@ -654,7 +654,7 @@ Entry to this mode runs the hooks on `comint-mode-hook'."
   (set (make-local-variable 'next-line-add-newlines) nil))
 
 (defun comint-check-proc (buffer)
-  "Return t if there is a living process associated w/buffer BUFFER.
+  "Return non-nil if there is a living process associated w/buffer BUFFER.
 Living means the status is `open', `run', or `stop'.
 BUFFER can be either a buffer or the name of one."
   (let ((proc (get-buffer-process buffer)))
@@ -667,7 +667,7 @@ If BUFFER is nil, it defaults to NAME surrounded by `*'s.
 PROGRAM should be either a string denoting an executable program to create
 via `start-process', or a cons pair of the form (HOST . SERVICE) denoting a TCP
 connection to be opened via `open-network-stream'.  If there is already a
-running process in that buffer, it is not restarted.  Optional third arg
+running process in that buffer, it is not restarted.  Optional fourth arg
 STARTFILE is the name of a file to send the contents of to the process.
 
 If PROGRAM is a string, any more args are arguments to PROGRAM."
@@ -1583,7 +1583,7 @@ See `comint-carriage-motion' for details.")
 
 (defun comint-snapshot-last-prompt ()
   "`snapshot' any current `comint-last-prompt-overlay'.
-freeze its attributes in place, even when more input comes a long
+Freeze its attributes in place, even when more input comes along
 and moves the prompt overlay."
   (when comint-last-prompt-overlay
     (let ((inhibit-read-only t)
@@ -2389,7 +2389,7 @@ updated using `comint-update-fence', if necessary."
   "Compute the defaults for `load-file' and `compile-file' commands.
 
 PREVIOUS-DIR/FILE is a pair (directory . filename) from the last
-source-file processing command.  nil if there hasn't been one yet.
+source-file processing command, or nil if there hasn't been one yet.
 SOURCE-MODES is a list used to determine what buffers contain source
 files: if the major mode of the buffer is in SOURCE-MODES, it's source.
 Typically, (lisp-mode) or (scheme-mode).