Help: Add notes for topic 'cpack-deb-component-dependencies'

Help/release/dev/cpack-deb-component-dependencies.rst

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+cpack-deb-component-dependencies
+--------------------------------
+
+* The :module:`CPackDeb` module learned a new
+  :variable:`CPACK_DEBIAN_<COMPONENT>_PACKAGE_DEPENDS`
+  option to specify per-component dependencies.