file-name-extension doc fix.

[Lute Kamstra]

Any objections to the following doc fix for file-name-extension?

  Lute.


Index: doc/lispref/files.texi
===================================================================
RCS file: /sources/emacs/emacs/doc/lispref/files.texi,v
retrieving revision 1.9
diff -C 3 -r1.9 files.texi
*** doc/lispref/files.texi      10 Nov 2008 15:29:12 -0000      1.9
--- doc/lispref/files.texi      11 Nov 2008 20:40:10 -0000
***************
*** 1701,1708 ****
  This function returns @var{filename}'s final ``extension,'' if any,
  after applying @code{file-name-sans-versions} to remove any
  version/backup part.  The extension, in a file name, is the part that
! starts with the last @samp{.} in the last name component (minus
! any version/backup part).
  
  This function returns @code{nil} for extensionless file names such as
  @file{foo}.  It returns @code{""} for null extensions, as in
--- 1701,1708 ----
  This function returns @var{filename}'s final ``extension,'' if any,
  after applying @code{file-name-sans-versions} to remove any
  version/backup part.  The extension, in a file name, is the part that
! follows the last @samp{.} in the last name component (minus any
! version/backup part).
  
  This function returns @code{nil} for extensionless file names such as
  @file{foo}.  It returns @code{""} for null extensions, as in
Index: doc/lispref/ChangeLog
===================================================================
RCS file: /sources/emacs/emacs/doc/lispref/ChangeLog,v
retrieving revision 1.142
diff -C 3 -r1.142 ChangeLog
*** doc/lispref/ChangeLog       11 Nov 2008 11:47:59 -0000      1.142
--- doc/lispref/ChangeLog       11 Nov 2008 20:40:12 -0000
***************
*** 1,3 ****
--- 1,8 ----
+ 2008-11-11  Lute Kamstra  <address@hidden>
+ 
+       * files.texi (File Name Components): Fix file-name-extension
+       documentation.
+ 
  2008-11-11  Juanma Barranquero  <address@hidden>
  
        * frames.texi (Basic Parameters): Remove display-environment-variable