Autogen: Add release notes for AUTOMOC_MACRO_NAMES

Help/release/dev/autogen-macro-names.rst

@@ -0,0 +1,12 @@
+autogen-macro-names
+-------------------
+
+* When using :prop_tgt:`AUTOMOC`, CMake searches for the strings ``Q_OBJECT``
+  and ``Q_OBJECT`` in a source file to determine if it needs to be ``moc``
+  processed. The new variable :variable:`CMAKE_AUTOMOC_MACRO_NAMES` allows to
+  register additional strings (macro names) so search for.
+
+* When using :prop_tgt:`AUTOMOC`, CMake searches for the strings ``Q_OBJECT``
+  and ``Q_OBJECT`` in a source file to determine if it needs to be ``moc``
+  processed. The new target property :prop_tgt:`AUTOMOC_MACRO_NAMES` allows to
+  register additional strings (macro names) so search for.