fixes #549 improve WeeklyCalendar documentation
fixes #549 improve WeeklyCalendar documentation

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

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