Update Doc/library/calendar.rst

Co-authored-by: Erlend E. Aasland <[email protected]>

Author: StanFromIreland

Doc/library/calendar.rst

@@ -408,7 +408,7 @@ The :mod:`calendar` module exports the following data attributes:
 .. data:: day_name
 
    A sequence that represents the days of the week in the current locale,
-   where Monday is day number ``0``.
+   where Monday is day number 0.
 
        >>> import calendar
        >>> list(calendar.day_name)