docs: cleanup/remove/update references to OID column.

Andres Freund <andres@anarazel.de>

Commit: f6b39171f3d65155b9390c2c69bc5b3469f923a8
Author: Andres Freund <andres@anarazel.de>
Date: 2019-04-18T00:22:56Z
Releases: 12.0
docs: cleanup/remove/update references to OID column.

I (Andres) missed these in 578b229718e8f.

Author: Justin Pryzby, editorialized a bit by Andres Freund
Reviewed-By: Daniel Verite, Andres Freund
Discussion: https://postgr.es/m/20190408002847.GA904@telsasoft.com

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