Autogen: Deprecation release notes for CMAKE_AUTOMOC_RELAXED_MODE

Help/release/dev/cmake_automoc_relaxed_mode.rst

@@ -0,0 +1,5 @@
+cmake_automoc_relaxed_mode
+--------------------------
+
+* The variable :variable:`CMAKE_AUTOMOC_RELAXED_MODE` is considered
+  deprecated.  Support still exists but will be removed in future versions.