doc: PG 13 relnotes, add pgbench script item

Bruce Momjian <bruce@momjian.us>

Commit: e0acac67da46951bf00d4d0df33a8020cac7308c
Author: Bruce Momjian <bruce@momjian.us>
Date: 2020-05-05T21:21:57Z
Releases: 13.0
doc:  PG 13 relnotes, add pgbench script item

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doc/src/sgml/release-13.sgml modified +12 −0

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