Craig Scott 5cb0a730c9 Help: Clarify behavior of search ignore-related variables ...

Not all the behaviors of CMake variables for ignoring search
locations by find_...() commands were fully documented.
Add the missing effects, clarify the wording and restructure the
way the details are assembled to reduce duplication.

Also improve the cross-referencing to ensure all the related
variables are more discoverable.

Issue: #20878

2022-03-13 14:29:05 +11:00

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