doc: PG 13 relnotes, fix markup

Bruce Momjian <bruce@momjian.us>

Commit: 7dc37ccea8599f460ec95b8a0208e2047a6fb4bf
Author: Bruce Momjian <bruce@momjian.us>
Date: 2020-05-05T21:45:34Z
Releases: 13.0
doc:  PG 13 relnotes, fix markup

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

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