Doc: Don't suppress doctest output

Author: Joseph-Edwards

docs/source/data-structures/presentations/to-present.rst

@@ -207,8 +207,11 @@ enumerates *kb*) prior to calling this function.
     >>> kb.run()
     >>> p2 = to(kb, rtype=(Presentation,))
     >>> for p in [p1, p2]:
-    ...     _ = presentation.sort_each_rule(p)
-    ...     _ = presentation.sort_rules(p)
+    ...     # Returns whether any changes have been made
+    ...     presentation.sort_each_rule(p)
+    ...     presentation.sort_rules(p)
+    True
+    False
     >>> p1 == p2
     True