Merge topic 'add_q_namespace_export_docs' into release-3.20

3538f1c69b Help: Add Q_NAMESPACE_EXPORT to CMAKE_AUTOMOC_MACRO_NAMES default values

Acked-by: Kitware Robot <[email protected]>
Merge-request: !5982

Help/variable/CMAKE_AUTOMOC_MACRO_NAMES.rst

@@ -11,7 +11,7 @@ This variable is used to initialize the :prop_tgt:`AUTOMOC_MACRO_NAMES`
 property on all the targets. See that target property for additional
 information.
 
-The default value is ``Q_OBJECT;Q_GADGET;Q_NAMESPACE``.
+The default value is ``Q_OBJECT;Q_GADGET;Q_NAMESPACE;Q_NAMESPACE_EXPORT``.
 
 Example
 ^^^^^^^