deleting unnecessary comment in docs

docs/custom-load-shape.rst

@@ -70,5 +70,4 @@ Extending the return value of the ``tick()`` with the argument ``user_classes``
 
             return None
 
-This shape would create create in the first 10 seconds 10 User of ``UserA``. In the next twenty seconds 40 of type ``UserA / UserB`` and this continues until the stages end.
-Using the extra argument makes it possible to create even more fine grained scenarios.
+This shape would create create in the first 10 seconds 10 User of ``UserA``. In the next twenty seconds 40 of type ``UserA / UserB`` and this continues until the stages end.