Subset of the trunk long-tail xref follow-up (commit cc97ee5332)
applicable to cassandra-4.0. Three files have broken patterns that
still apply on this branch after PR #4807's forward-merge: the
architecture index, finding_nodes, and use_tools self-page xrefs.
Six edits total. Mechanical retargets only; no prose was rewritten.
Edits omitted (trunk-only):
* Twenty files introduced in 5.0 or later (developing/cql/, reference/
cql-commands/, managing/operating/, etc).
* use_tools.adoc edits 4 and 5 (different line state on 4.x;
packet-capture anchor section structure differs).
patch by Patrick McFadin; reviewed by Mick Semb Wever for CASSANDRA-21342
19ee803038