doc: more XML markup for PG 14 release notes

Bruce Momjian <bruce@momjian.us>

Commit: 55370f8db96c8416940ad0b05be7a00a9f059a9f
Author: Bruce Momjian <bruce@momjian.us>
Date: 2021-05-21T20:16:56Z
Releases: 14.0
doc:  more XML markup for PG 14 release notes

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doc/src/sgml/release-14.sgml modified +134 −131

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