Document how `override.cfg` works in relation with feature tags

getting_started/workflow/export/feature_tags.rst

@@ -109,6 +109,15 @@ After overriding, a new field is added for this specific configuration:
 
 .. image:: img/feature_tags3.png
 
+.. note::
+
+    When using the
+    :ref:`project settings "override.cfg" functionality <class_ProjectSettings>`
+    (which is unrelated to feature tags), remember that feature tags still apply.
+    Therefore, make sure to *also* override the setting with the desired feature
+    tag(s) if you want them to override base project settings on all platforms
+    and configurations.
+
 Default overrides
 -----------------