Fix comment in CalendarOrdinal to make it consistent with the number of bits used for calendars in YearMonthDayCalendar.
Fix comment in CalendarOrdinal to make it consistent with the number of bits used for calendars in YearMonthDayCalendar.

jskeet/nodatime,jskeet/nodatime,malcolmr/nodatime,BenJenkinson/nodatime,malcolmr/nodatime,malcolmr/nodatime,BenJenkinson/nodatime,nodatime/nodatime,nodatime/nodatime,malcolmr/nodatime