Thread: pgsql: Update release notes for recent changes; also minor

Log Message:
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Update release notes for recent changes; also minor editorialization.

Modified Files:
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    pgsql/doc/src/sgml:
        release.sgml (r1.310 -> r1.311)
        (http://developer.postgresql.org/cvsweb.cgi/pgsql/doc/src/sgml/release.sgml.diff?r1=1.310&r2=1.311)