Fix documentation for Calendar.iterweekdays(): firstweekday is a property.
Fixes second part of #2018.
diff --git a/Doc/library/calendar.rst b/Doc/library/calendar.rst
index 364ce2a..511edbc 100644
--- a/Doc/library/calendar.rst
+++ b/Doc/library/calendar.rst
@@ -39,9 +39,9 @@
.. method:: Calendar.iterweekdays(weekday)
- Return an iterator for the week day numbers that will be used for one week. The
- first number from the iterator will be the same as the number returned by
- :meth:`firstweekday`.
+ Return an iterator for the week day numbers that will be used for one week.
+ The first value from the iterator will be the same as the value of the
+ :attr:`firstweekday` property.
.. method:: Calendar.itermonthdates(year, month)