doc: update PG 11 release notes with suggested changes

Bruce Momjian <bruce@momjian.us>

Commit: cf9c75ccea0bc15ce54c6fb017cd3edba03da743
Author: Bruce Momjian <bruce@momjian.us>
Date: 2018-05-14T20:41:49Z
Releases: 11.0
doc:  update PG 11 release notes with suggested changes

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doc/src/sgml/release-11.sgml modified +38 −56

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