fixed incorrect kick() with kickParticipant() in doc/API.md

doc/API.md

 
     Note: available only for moderator
 
-24. kick(id) - Kick participant from the conference
+24. kickParticipant(id) - Kick participant from the conference
     - id - string participant id
 
 25. setStartMutedPolicy(policy) - make all new participants join with muted audio/video