Define-key doc string - binding changes always if it exists

[Lennart Borgman]

I found the doc string for define-key a bit strange. It kind of suggests 
that if the keymap is not sparse then it is not changed. I suggest the 
following patch:

Index: keymap.c
===================================================================
RCS file: /cvsroot/emacs/emacs/src/keymap.c,v
retrieving revision 1.306
diff -u -r1.306 keymap.c
--- keymap.c    7 Aug 2005 12:33:17 -0000    1.306
+++ keymap.c    10 Aug 2005 19:42:37 -0000
@@ -1105,9 +1105,8 @@
    (DEFN should be a valid definition in its own right),
 or a cons (MAP . CHAR), meaning use definition of CHAR in keymap MAP.

-If KEYMAP is a sparse keymap with a binding for KEY, the existing
-binding is altered.  If there is no binding for KEY, the new pair
-binding KEY to DEF is added at the front of KEYMAP.  */)
+If KEYMAP is a sparse keymap and there is no binding for KEY, the new
+pair binding KEY to DEF is added at the front of KEYMAP.  */)
     (keymap, key, def)
     Lisp_Object keymap;
     Lisp_Object key;