doc: PG 13 relnotes: move docbook version change to doc sect.

Bruce Momjian <bruce@momjian.us>

Commit: 1255466f8358ecac29581aa5ecec76628dc2e33c
Author: Bruce Momjian <bruce@momjian.us>
Date: 2020-05-14T15:51:18Z
Releases: 13.0
doc:  PG 13 relnotes:  move docbook version change to doc sect.

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doc/src/sgml/release-13.sgml modified +9 −9

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