docs: PG 12 relnotes, update self-join item to mention ctid

Bruce Momjian <bruce@momjian.us>

Commit: be2e024bd6527b050da4ad02c921869fed84bb5d
Author: Bruce Momjian <bruce@momjian.us>
Date: 2019-06-14T02:53:20Z
Releases: 12.0
docs:  PG 12 relnotes, update self-join item to mention ctid

Reported-by: Robert Haas

Discussion: https://postgr.es/m/CA+TgmoY==TZwk-4cM3Usebq1f=j7Hpm1brFbk1v48h45wsWzzg@mail.gmail.com

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