Also adds a description explaining gizmo priority. Inferred from: e4363d001a/editor/plugins/spatial_editor_plugin.cpp (L5867-L5880) e4363d001a/editor/plugins/spatial_editor_plugin.cpp (L6462-L6470) (cherry picked from commit c6919a13da)
e4363d001a/editor/plugins/spatial_editor_plugin.cpp (L5867-L5880)
e4363d001a/editor/plugins/spatial_editor_plugin.cpp (L6462-L6470)
c6919a13da