[AC21.5] Silly little doc patch

APPROVE COMMIT 21.5

Like it says.

diff -r b94d6e89ea5b src/ChangeLog
--- a/src/ChangeLog	Wed Jun 18 09:26:54 2014 +0100
+++ b/src/ChangeLog	Thu Jun 19 12:08:42 2014 +0900
@@ -1,3 +1,7 @@
+2014-06-19  Stephen J. Turnbull  <[email protected]>
+
+	* buffer.c (case_fold_search): Improve docstring.
+
 2014-06-18  Aidan Kehoe  <[email protected]>
 
 	Correct a couple of things in my last change.
diff -r b94d6e89ea5b src/buffer.c
--- a/src/buffer.c	Wed Jun 18 09:26:54 2014 +0100
+++ b/src/buffer.c	Thu Jun 19 12:08:42 2014 +0900
@@ -2502,7 +2502,7 @@
 */ );
 
   DEFVAR_BUFFER_LOCAL ("case-fold-search", case_fold_search /*
-*Non-nil if searches should ignore case.
+*If non-nil, searches and matches should ignore case.
 Automatically becomes buffer-local when set in any fashion.
 */ );