fixup support Vect16

Author: james-d-mitchell

tests/test_hpcombi.py

@@ -303,7 +303,9 @@ def test_hpcombi_ptransf16_largest_fix_point():
         assert PTransf16.one().largest_fix_point() == 15
 
     def test_hpcombi_ptransf16_largest_moved_point():
-        # FIXME in HPCombi, is this the correct behaviour??
+        # TODO update if
+        # https://github.com/libsemigroups/HPCombi/issues/65
+        # is ever resolved.
         assert PTransf16([1, 3, 2, 255, 10]).largest_moved_point() == 15
         assert PTransf16([1, 3, 2, 255, 10])[15] == 255