doc: Fix PG 13 release note markup

Bruce Momjian <bruce@momjian.us>

Commit: 3114d26bfb93962e503df19210086abe67f2044e
Author: Bruce Momjian <bruce@momjian.us>
Date: 2020-05-05T14:33:50Z
Releases: 13.0
doc:  Fix PG 13 release note markup

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doc/src/sgml/release-13.sgml modified +2 −0

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