Update src/icalendar/cal.py

Co-authored-by: Steve Piercy <web@stevepiercy.com>

src/icalendar/cal.py

@@ -716,7 +716,7 @@ def alarms(self) -> Alarms:
         >>> alarm_time.is_active()  # This alarm has not been acknowledged
         True
 
-        Note that this only uses DTSTART and DTEND but ignores
+        Note that this only uses DTSTART and DTEND, but ignores
         RDATE, EXDATE and RRULE properties.
         """
         from icalendar.alarms import Alarms