Updates `Y.Lang.sub`'s documentation, as it currently provides very little information.
Moving of deprecation notice up.
Addition of `useNative` documentation.
Improving of `query`'s documentation.
Addition of `filter` documentation.
Addition of `test` documentation.
Improving of `ancestor`'s documentation.
Improve consistency of `ancestor`'s argument name and documentation.
Merge branches 'lang-sub-doc-update', 'menunav-doc-fix' and 'selector-doc-update' into live-docs