update doc string

Kevin Matocha · Kevin Matocha · commit 65837a9941f1 · 2022-02-02T09:23:37.000-06:00
diff --git a/shared-bindings/displayio/Display.c b/shared-bindings/displayio/Display.c
@@ -444,7 +444,7 @@ const mp_obj_property_t displayio_display_bus_obj = {
               MP_ROM_NONE},
 };
 
-//|     root_group: _Group
+//|     root_group: Group
 //|     """The root group on the display."""
 //|
 //|
