More toggle-read-only doc tweaks

* lisp/files.el (toggle-read-only): Re-add basic doc-string.

* lisp/vc/vc-hooks.el (vc-toggle-read-only): Tweak obsolescence mesage.

lisp/ChangeLog

 2014-07-25  Glenn Morris  <rgm@gnu.org>
 
+	* files.el (toggle-read-only): Re-add basic doc-string.
+	* vc/vc-hooks.el (vc-toggle-read-only): Tweak obsolescence mesage.
+
 	* progmodes/prolog.el (prolog-mode-keybindings-edit):
 	Replace missing `switch-to-prolog' with `run-prolog'.
 	(switch-to-prolog): Define as (obsolete) alias, as in 23.4.

lisp/files.el

@@ -5012,6 +5012,7 @@ prints a message in the minibuffer.  Instead, use `set-buffer-modified-p'."
   (set-buffer-modified-p arg))
 
 (defun toggle-read-only (&optional arg interactive)
+  "Change whether this buffer is read-only."
   (declare (obsolete read-only-mode "24.3"))
   (interactive (list current-prefix-arg t))
   (if interactive

lisp/vc/vc-hooks.el

@@ -628,8 +628,15 @@ this function."
 	       (throw 'found trial))))
        templates))))
 
-(define-obsolete-function-alias
-  'vc-toggle-read-only 'toggle-read-only "24.1")
+
+;; toggle-read-only is obsolete since 24.3, but since vc-t-r-o was made
+;; obsolete earlier, it is ok for the latter to be an alias to the former,
+;; since the latter will be removed first.  We can't just make it
+;; an alias for read-only-mode, since that is not 100% the same.
+(defalias 'vc-toggle-read-only 'toggle-read-only)
+(make-obsolete 'vc-toggle-read-only
+               "use `read-only-mode' instead (or `toggle-read-only' in older version of Emacs)."
+               "24.1")
 
 (defun vc-default-make-version-backups-p (_backend _file)
   "Return non-nil if unmodified versions should be backed up locally.