Docs for paired braces feature.

* doc/changes.texi: Document enhanced paired braces feature.

* doc/auctex.texi: Ditto.

Signed-off-by: Tassilo Horn <tsdh@gnu.org>
fix author in ChangeLog
Fix typos.

	* doc/auctex.texi (Quotes): Fix typo.

	* doc/changes.texi: Ditto.