doc: complete adding XML markup to PG 14 relnotes

Bruce Momjian <bruce@momjian.us>

Commit: 0cdaa05b40e9f28e5d6d58ccd06fe19f3cd920c9
Author: Bruce Momjian <bruce@momjian.us>
Date: 2021-05-22T00:51:53Z
Releases: 14.0
doc:  complete adding XML markup to PG 14 relnotes

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doc/src/sgml/release-14.sgml modified +129 −116

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