doc: PG 13 relnotes: fix xref link and remove extra word

Bruce Momjian <bruce@momjian.us>

Commit: ec5afb0a4e050616fe6953e597fd1f61d47edc3a
Author: Bruce Momjian <bruce@momjian.us>
Date: 2020-05-15T12:29:57Z
Releases: 13.0
doc:  PG 13 relnotes:  fix xref link and remove extra word

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doc/src/sgml/release-13.sgml modified +2 −2

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