Help: Fix inaccuracies and omissions in MACHO_* property docs

Craig Scottrequested to merge
craig.scott/cmake:docs_macho_prop_tgt into master

The VERSION and SOVERSION properties are not true fallbacks for the MACHO_* properties since the MACHO_* properties only affect the embedded version information, but VERSION and SOVERSION also affect other things.

Backport: release

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