bug#32817: 27.0.50; Dotted pair syntax for directory-local variables

[Phil Sainty]

Do we want a NEWS entry for this?

It's a user-visible change, even if the *effective* behaviour is
identical.

I'm mostly thinking it's worth flagging in NEWS for the sake of
users who have previously rejected the `add-dir-local-variable'
command on the basis that it wrecks their .dir-locals.el
formatting.


-Phil