Help: Document that <PackageName>_ROOT applies to config packages too
The original intent of <PackageName>_ROOT may have been for it to apply only to Find modules, but the implementation of the find_package() command treats modules and config packages the same. Both result in a <PackageName>_ROOT variable being pushed onto the stack of package roots. A config package can also call other find_...() commands, the behavior doesn't apply just to find modules.
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