[ci skip] Fix typo in output documentation.

Author: wmwolf

docs/source/using_mesa/output.rst

@@ -233,7 +233,7 @@ To plot a temperature-density profile, the process is very similar:
    import mesa_reader as mr
 
    # load entire LOG directory information
-   l = MesaLogDir('./LOGS')
+   l = mr.MesaLogDir('./LOGS')
    # grab the last profile
    p = l.profile_data()