Fix broken example, reported by Codemanx on IRC, thanks.

doc/python_api/examples/bpy.types.UIList.2.py

@@ -8,7 +8,7 @@ example of how to create/use filtering/reordering callbacks.
 import bpy
 
 
-class MESH_UL_vgroups_slow(UIList):
+class MESH_UL_vgroups_slow(bpy.types.UIList):
     # Constants (flags)
     # Be careful not to shadow FILTER_ITEM!
     VGROUP_EMPTY = 1 << 0

release/scripts/templates_py/ui_list.py

@@ -1,7 +1,7 @@
 import bpy
 
 
-class MESH_UL_mylist(UIList):
+class MESH_UL_mylist(bpy.types.UIList):
     # Constants (flags)
     # Be careful not to shadow FILTER_ITEM (i.e. UIList().bitflag_filter_item)!
     # E.g. VGROUP_EMPTY = 1 << 0