Doc: fix a few oddly-spelled SGML ID attributes.

Tom Lane <tgl@sss.pgh.pa.us>

Commit: 09d465c397165f99c37e9002a4e7b281111d2580
Author: Tom Lane <tgl@sss.pgh.pa.us>
Date: 2023-01-17T22:13:20Z
Releases: 16.0
Doc: fix a few oddly-spelled SGML ID attributes.

Avoid use of "_" in SGML IDs.  Awhile back that was actually
disallowed by the toolchain, as a consequence of which our convention
has been to use "-" instead.  Fix a couple of stragglers that are
particularly inconsistent with that convention and with related IDs.

This is just neatnik-ism, so no need for back-patch.

Discussion: https://postgr.es/m/769446.1673478332@sss.pgh.pa.us

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