doc: PG 13 relnotes: add duplicate btree optimization details

Bruce Momjian <bruce@momjian.us>

Commit: aa976d3b9004bd2c275e4ad17fa897ce5fe5127e
Author: Bruce Momjian <bruce@momjian.us>
Date: 2020-05-12T01:24:08Z
Releases: 13.0
doc:  PG 13 relnotes:  add duplicate btree optimization details

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

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