Fix markup

pep-0008.txt

@@ -841,10 +841,14 @@ Programming Recommendations
   whenever they do something other than acquire and release resources.
   For example:
 
-      Yes:     with conn.begin_transaction():
+  Yes::
+
+               with conn.begin_transaction():
                    do_stuff_in_transaction(conn)
 
-      No:      with conn:
+  No::
+
+               with conn:
                    do_stuff_in_transaction(conn)
 
   The latter example doesn't provide any information to indicate that