updated for version 7.3.423

Problem:    Small mistakes in comments, proto and indent.
Solution:   Fix the mistakes.

Also update runtime files

runtime/doc/insert.txt

@@ -1,4 +1,4 @@
-*insert.txt*    For Vim version 7.3.  Last change: 2011 Sep 14
+*insert.txt*    For Vim version 7.3.  Last change: 2012 Jan 26
 
 
 		  VIM REFERENCE MANUAL    by Bram Moolenaar
@@ -1010,7 +1010,8 @@ number between zero and the cursor column "col('.')".  This involves looking
 at the characters just before the cursor and including those characters that
 could be part of the completed item.  The text between this column and the
 cursor column will be replaced with the matches.  Return -1 if no completion
-can be done.
+can be done, the completion will be cancelled with an error message.  Return
+-2 to cancel silently.
 
 On the second invocation the arguments are:
    a:findstart  0