doc: PG 13 relnotes: add documentation section and reformat

Bruce Momjian <bruce@momjian.us>

Commit: b89d90b051a1da7a447b25dc749ce42ccb4dc5bd
Author: Bruce Momjian <bruce@momjian.us>
Date: 2020-05-12T02:58:47Z
Releases: 13.0
doc:  PG 13 relnotes:  add documentation section and reformat

Add section about function table reformatting.

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doc/src/sgml/release-13.sgml modified +22 −1

Documentation touched