bug#12345: 24.2.50; doc string of `text-scale-adjust'

[Drew Adams]

> > from emacs -q, try to edebug-defun `text-scale-adjust', 
> > then use `C-x C-+', then `c' in the debug loop, then quit.
> > The temporary keymap is not temporary anymore, and the `-'
> > and `+' keys are still bounded to `text-scale-adjust'.
> 
> There was a bug in edebug.el's handling of pre/post-command-hook.
> I just fixed it and it fixes your above recipe.

Do you think that fix might also help with bug #12232?
That would be great.