cong: update test

Author: james-d-mitchell

src/cong.cpp

@@ -68,7 +68,7 @@ individual algorithms, such as :any:`Kambites`,
     >>> is_obviously_infinite(cong)
     True
     >>> cong.add_generating_pair([1, 1, 1], [])
-    <Congruence over <monoid presentation with 2 letters, 1 rule, and length 2> with 4 runners>
+    <2-sided Congruence over <monoid presentation with 2 letters, 1 rule, and length 2> with 1 gen. pair, 4 runners>
     >>> cong.number_of_classes()
     3
     >>> is_obviously_infinite(cong)
@@ -250,7 +250,7 @@ obviously infinite; ``False`` is returned if it is not.
     congruence has infinitely many classes.
 )pbdoc");
     }  // bind_cong
-  }    // namespace
+  }  // namespace
 
   void init_cong(py::module& m) {
     bind_cong<word_type>(m, "CongruenceWord");