Update release notes to say citext is multi-byte aware, per suggestion

Bruce Momjian <bruce@momjian.us>

Commit: 038777081a15ba0b9c12e5f1b749c8a9142a8473
Author: Bruce Momjian <bruce@momjian.us>
Date: 2009-03-28T14:15:15Z
Releases: 8.4.0
Update release notes to say citext is multi-byte aware, per suggestion
from patch author:

       Add /contrib/citext as a case-insensitive, multibyte-capable
	text data type (David Wheeler)

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doc/src/sgml/release.sgml modified +2 −2