Ediff doc suggestion

[Leo]

Hi there,

The doc strings for ediff-diff-options and ediff-custom-diff-options
are not clear. As commented by Stefan Monnier in
http://thread.gmane.org/gmane.emacs.help/39512/focus=39512

,----
| There's a bug in the docstring of ediff-diff-options: it only
| mentions "-c" as not allowed, but -u is not allowed either IIUC.
| These options are those used internally by ediff to compute the
| highlighting and things like that.  The options that affect the
| display of patches are configured in another variable.  I believe
| it's ediff-custom-diff-options.
`----

Don't you think we should incorporate those changes?

-- 
Leo <sdl.web AT gmail.com>                         (GPG Key: 9283AA3F)