Help: Add notes for topic 'cpack-rpm-component-descriptions'

Help/release/dev/cpack-rpm-component-descriptions.rst

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+cpack-rpm-component-descriptions
+--------------------------------
+
+* The :module:`CPackRPM` module learned options to set per-component
+  descriptions and summaries.  See the
+  :variable:`CPACK_RPM_<component>_PACKAGE_DESCRIPTION` and
+  :variable:`CPACK_RPM_<component>_PACKAGE_SUMMARY` variables.