Document limit on the number of out-of-line values per table

John Naylor <john.naylor@postgresql.org>

Commit: 409be33c3136dce56f7605dd4f9b4e8fe7f5d693
Author: John Naylor <john.naylor@postgresql.org>
Date: 2024-08-20T06:36:33Z
Releases: 16.5
Document limit on the number of out-of-line values per table

Document the hard limit stemming from the size of an OID, and also
mention the perfomance impact that occurs before the hard limit
is reached.

Jakub Wartak and Robert Haas
Backpatch to all supported versions

Discussion: https://postgr.es/m/CAKZiRmwWhp2yxjqJLwbBjHdfbJBcUmmKMNAZyBjjtpgM9AMatQ%40mail.gmail.com

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