doc: markup for PG 11 release notes and included email tips

Bruce Momjian <bruce@momjian.us>

Commit: 6186d0bd615ed2eb921ad13ccdf4ceed19d3f7a8
Author: Bruce Momjian <bruce@momjian.us>
Date: 2018-05-11T18:47:26Z
Releases: 11.0
doc:  markup for PG 11 release notes and included email tips

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doc/src/sgml/release-11.sgml modified +554 −396

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