Update release notes with security issues.

Tom Lane <tgl@sss.pgh.pa.us>

Commit: 9d4e01ca3ef847748b96bdc69f88b7368ca95811
Author: Tom Lane <tgl@sss.pgh.pa.us>
Date: 2010-05-13T21:27:08Z
Releases: 8.4.4
Update release notes with security issues.

Security: CVE-2010-1169, CVE-2010-1170

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