docs: remove unnecessary references to old PG versions

Bruce Momjian <bruce@momjian.us>

Commit: 6f14a6f703a26ec12f4da6f53f107dd260fbb9db
Author: Bruce Momjian <bruce@momjian.us>
Date: 2014-02-24T17:56:37Z
Releases: 9.4.0
docs:  remove unnecessary references to old PG versions

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