Help: Add notes for topic 'fix-OSX-bundle-rpaths-and-Qt5'

Help/release/dev/fix-OSX-bundle-rpaths-and-Qt5.rst

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+fix-OSX-bundle-rpaths-and-Qt5
+-----------------------------
+
+* The :module:`BundleUtilities` module learned to resolve and replace
+  ``@rpath`` placeholders on OS X to correctly bundle applications
+  using them.