fix comment

Signed-off-by: Julien Veyssier <julien-nc@posteo.net>

Author: julien-nc

lib/Event/ExchangedTokenRequestedEvent.php

@@ -12,7 +12,7 @@
 use OCP\EventDispatcher\Event;
 
 /**
- * This event is emitted with by other apps which need an exchanged token for another audience (another client ID)
+ * This event is emitted by other apps which need an exchanged token for another audience (another client ID)
  */
 class ExchangedTokenRequestedEvent extends Event {