doc: PG 13 retnote adjustments

Bruce Momjian <bruce@momjian.us>

Commit: ab3f2f45d28235ee60ac2426f2282f401a0b0c12
Author: Bruce Momjian <bruce@momjian.us>
Date: 2020-05-05T17:18:07Z
Releases: 13.0
doc: PG 13 retnote adjustments

Reported-by: Justin Pryzby

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doc/src/sgml/release-13.sgml modified +15 −15

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