Help: Add notes for topic 'Xcode-clang-compile-features'

Help/release/dev/Xcode-clang-compile-features.rst

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+Xcode-clang-compile-features
+----------------------------
+
+* The :manual:`Compile Features <cmake-compile-features(7)>` functionality
+  is now aware of features supported by Apple Clang (``AppleClang``).