Update firedrake/mesh.py

Co-authored-by: Connor Ward <c.ward20@imperial.ac.uk>

Author: ksagiyam

firedrake/mesh.py

@@ -1756,7 +1756,7 @@ def _ufl_mesh(self):
     @property
     def dm_cell_types(self):
         """All ``DM.PolytopeType``s of cells in the mesh."""
-        raise NotImplementedError("Notimplemented for ExtrudedMeshTopology")
+        raise NotImplementedError("'dm_cell_types' is not implemented for ExtrudedMeshTopology")
 
     @utils.cached_property
     def cell_closure(self):