doc: PG 13 relnotes: adjust wording and Unicode item

Bruce Momjian <bruce@momjian.us>

Commit: db9e99da2c61f46bfe37032bab1ee602e5c8335c
Author: Bruce Momjian <bruce@momjian.us>
Date: 2020-05-07T14:01:22Z
Releases: 13.0
doc: PG 13 relnotes:  adjust wording and Unicode item

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doc/src/sgml/release-13.sgml modified +3 −7

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