FeatureSummary: Update release notes

Help/release/dev/FeatureSummary_enhancement.rst

+FeatureSummary_enhancement
+--------------------------
+
+* The :command:`set_package_info`, :command:`set_feature_info`,
+  :command:`print_enabled_features` and :command:`print_disabled_features`
+  commands from the the :module:`FeatureSummary` module are now deprecated.
+
+* The :command:`set_package_properties` command no longer forces the package
+  type to ``OPTIONAL`` when the type is not explicitly set.
+
+* The :command:`feature_summary` command in the :module:`FeatureSummary` module
+  accepts the new ``QUIET_ON_EMPTY`` option that will suppresses the output when
+  the list of packages that belong to the selected category is empty.
+
+* The :command:`add_feature_info` in the :module:`FeatureSummary` module learned
+  to accept lists of dependencies for deciding whether a feature is enabled or
+  not.
+
+* The package types accepted by the the :module:`FeatureSummary` module can now
+  be tweaked by changing the :variable:`FeatureSummary_PKG_TYPES`,
+  :variable:`FeatureSummary_REQUIRED_PKG_TYPES` and
+  :variable:`FeatureSummary_DEFAULT_PKG_TYPE` global properties.