Further doc updates to reflect MD5 deprecation

John Naylor <john.naylor@postgresql.org>

Commit: cdcab17e7e5deb3fa843214ca1215023735b45cb
Author: John Naylor <john.naylor@postgresql.org>
Date: 2026-01-07T04:57:05Z
Releases: 18.2
Further doc updates to reflect MD5 deprecation

Followup to 44f49511b.

Author: Fujii Masao <masao.fujii@gmail.com>
Reviewed-by: Heikki Linnakangas <hlinnaka@iki.fi>
Discussion: https://postgr.es/m/CAHGQGwH_UfN96vcvLGA%3DYro%2Bo6qCn0nEgEGoviwzEiLTHtt2Pw%40mail.gmail.com
Backpatch-through: 18

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