(Fmap_keymap): Doc fix.

src/keymap.c

@@ -743,8 +743,10 @@ map_keymap_call (key, val, fun, dummy)
 }
 
 DEFUN ("map-keymap", Fmap_keymap, Smap_keymap, 2, 3, 0,
-       doc: /* Call FUNCTION for every binding in KEYMAP.
-FUNCTION is called with two arguments: the event and its binding.
+       doc: /* Call FUNCTION once for each binding in KEYMAP.
+FUNCTION is called with two arguments: the event that is bound, and
+the definition it is bound to.
+
 If KEYMAP has a parent, the parent's bindings are included as well.
 This works recursively: if the parent has itself a parent, then the
 grandparent's bindings are also included and so on.