doc: PG 13 relnotes, add attributions and wording changes

Bruce Momjian <bruce@momjian.us>

Commit: b0e02f47cdb0be44a229e261e932221575381269
Author: Bruce Momjian <bruce@momjian.us>
Date: 2020-05-05T20:31:45Z
Releases: 13.0
doc: PG 13 relnotes, add attributions and wording changes

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