Document the new and improved size requirements due to YearMonthDayCalendar.
Document the new and improved size requirements due to YearMonthDayCalendar.

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