Doc: clarify enable_indexscan=off also disabled Index Only Scans

David Rowley <drowley@postgresql.org>

Commit: 75f09cc460a3a1780df1dcd102f46e59779f9903
Author: David Rowley <drowley@postgresql.org>
Date: 2024-10-29T03:25:29Z
Releases: 15.9
Doc: clarify enable_indexscan=off also disabled Index Only Scans

Disabling enable_indexscan has always also disabled Index Only Scans.
Here we make that more clear in the documentation in an attempt to
prevent future complaints complaining about this expected behavior.

Reported-by: Melanie Plageman
Author: David G. Johnston, David Rowley
Backpatch-through: 12, oldest supported version
Discussion: https://postgr.es/m/CAAKRu_atV=kovgpaLREyG68PB5+ncKvJ2UNoeRetEgyC3Yb5Sw@mail.gmail.com

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