docs: update PG 11 release notes based on feedback

Bruce Momjian <bruce@momjian.us>

Commit: 3122e320913db0288d0b96a7eb65401962c4781b
Author: Bruce Momjian <bruce@momjian.us>
Date: 2018-05-15T19:55:53Z
Releases: 11.0
docs:  update PG 11 release notes based on feedback

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doc/src/sgml/release-11.sgml modified +42 −2

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