Fix some comments referring to past features

Michael Paquier <michael@paquier.xyz>

Commit: 7a3543c2ea23d032865f207c2605942b7a32e9ba
Author: Michael Paquier <michael@paquier.xyz>
Date: 2020-06-15T12:18:14Z
Releases: 14.0
Fix some comments referring to past features

Timestamp can only be an int64 since b9d092c, and support for WITH OIDS
has been removed as of 578b229.

Author: Justin Pryzby
Discussion: https://postgr.es/m/20200612023709.GC14879@telsasoft.com

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