remove trailing whitespace

Author: ethanfurman

Doc/howto/enum.rst

@@ -310,7 +310,7 @@ Iterating over the members of an enum does not provide the aliases::
 Note that ``Shape.ALIAS_FOR_SQUARE`` does not show up.  And::
 
     >>> list(Weekday)
-    [<Weekday.MONDAY: 1>, <Weekday.TUESDAY: 2>, <Weekday.WEDNESDAY: 4>, <Weekday.THURSDAY: 8>, <Weekday.FRIDAY: 16>, <Weekday.SATURDAY: 32>, <Weekday.SUNDAY: 64>, 
+    [<Weekday.MONDAY: 1>, <Weekday.TUESDAY: 2>, <Weekday.WEDNESDAY: 4>, <Weekday.THURSDAY: 8>, <Weekday.FRIDAY: 16>, <Weekday.SATURDAY: 32>, <Weekday.SUNDAY: 64>,
 
 ``Weekday.WEEKEND`` does not show up.