Update test_Saver__ugrid.py

Correct comment, since after #6004 the behaviour, and the testcase changed but the comment did not !

lib/iris/tests/unit/fileformats/netcdf/saver/test_Saver__ugrid.py

@@ -178,7 +178,7 @@ def mesh_location_size(mesh, location):
 
 
 # A simple "standard" test mesh for multiple uses, which we can use for cubes
-# that *share* a mesh (since we don't support mesh equality).
+# that ** a mesh (since we don't support mesh equality).
 # However, we defer creating this until needed, as it can cause an import loop.
 _DEFAULT_MESH = None
 
@@ -1199,7 +1199,7 @@ def test_multiple_equal_mesh(self):
 
  def test_multiple_different_meshes(self):
  # Create 2 meshes with different faces, but same edges.
- # N.B. they should *not* then share an edge dimension !
+ # N.B. they should then share an edge dimension.
  mesh1 = make_mesh(n_faces=3, n_edges=2)
  mesh2 = make_mesh(n_faces=4, n_edges=2)