small update to the documentation of recurring events in 57_Calendar.pm

git-svn-id: svn://svn.code.sf.net/p/fhem/code@5451 2b470e98-0d58-463d-a4d8-8e2adae1ed80
notify/FileLog/FHEMWEB/watchdog/eventTypes: addStateEvent attribute added


git-svn-id: svn://svn.code.sf.net/p/fhem/code@5452 2b470e98-0d58-463d-a4d8-8e2adae1ed80