bug#7777: 24.0.50; incompatible change for `directory-abbrev-alist' not in NEWS

[Eli Zaretskii]

> From: "Drew Adams" <drew.adams@oracle.com>
> Cc: <7777@debbugs.gnu.org>
> Date: Mon, 3 Jan 2011 13:44:50 -0800
> 
> 1. We're telling users that _every_ value should be different from what 
> _every_
> value was supposed to be before. That's a change for users that they should be
> made aware of, even if such a "should" is in fact vacuous wrt the difference.

It's not a change, it's a doc fix.  The doc string is now more
helpful.

> 2. We should tell users, in NEWS, that they do _not_ in fact need to change
> existing values that respected the old rule - in spite of the changed rule.
> They do _not_ need to swap \\` for ^.  That is not necessarily obvious to 
> users.

We don't put in NEWS changes that affect only doc strings.

How about if we change the doc string to not sound like a stringent
requirement, but rather as a "note"?