Update release notes with security issues.

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

Commit: 405f02b083a34abc68ef6e01056380cc3858ad91
Author: Tom Lane <tgl@sss.pgh.pa.us>
Date: 2010-05-13T21:27:15Z
Releases: 8.3.11
Update release notes with security issues.

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

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