Add more verbosity for property overrides in RST documentation

(cherry picked from commit 38821dc6d7)

doc/tools/makerst.py

@@ -412,7 +412,7 @@ def make_rst_class(class_def, state, dry_run, output_dir):  # type: (ClassDef, S
             type_rst = property_def.type_name.to_rst(state)
             default = property_def.default_value
             if property_def.overridden:
-                ml.append((type_rst, property_def.name, "**O:** " + default))
+                ml.append((type_rst, property_def.name, default + " *(parent override)*"))
             else:
                 ref = ":ref:`{0}<class_{1}_property_{0}>`".format(property_def.name, class_name)
                 ml.append((type_rst, ref, default))