fix typos

Author: jutik0

articles/communication-services/concepts/call-automation/call-automation.md

@@ -164,8 +164,8 @@ The Call Automation events are sent to the web hook callback URI specified when
 | CallTransferFailed  | The transfer of your application’s call leg failed  |
 | AddParticipantSucceeded| Your application added a participant  |
 | AddParticipantFailed   | Your application was unable to add a participant  |
-| CancelAddParticipantSucceeded| Your application cancelled adding a participant  |
-| CancelAddParticipantFailed   | Your application was unable cancel adding a participant  |
+| CancelAddParticipantSucceeded| Your application canceled adding a participant  |
+| CancelAddParticipantFailed   | Your application was unable to cancel adding a participant  |
 | RemoveParticipantSucceeded| Your application has successfully removed a participant from the call.  |
 | RemoveParticipantFailed   | Your application was unable to remove a participant from the call.  |
 | ParticipantsUpdated    | The status of a participant changed while your application’s call leg was connected to a call  |