FindLibXml2: Document LibXml2_FOUND as preferred case
Both `LIBXML2_FOUND` and `LibXml2_FOUND` are provided but the modern convention is to use the case that matches the module name.
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Both `LIBXML2_FOUND` and `LibXml2_FOUND` are provided but the modern convention is to use the case that matches the module name.
mentioned in commit 029abf97
·mentioned in commit 029abf97