fixes #550 improve AnnualCalendar.DaysExcluded documentation
fixes #550 improve AnnualCalendar.DaysExcluded documentation

# Conflicts:
#	src/Quartz/Impl/Calendar/AnnualCalendar.cs

quartznet/quartznet,sean-gilliam/quartznet,quartznet/quartznet,quartznet/quartznet,sean-gilliam/quartznet,sean-gilliam/quartznet,quartznet/quartznet,sean-gilliam/quartznet,sean-gilliam/quartznet,quartznet/quartznet