Added REST fixes

Author: mnocon

docs/api/rest_api/rest_api_reference/input/ibexa-types.raml

@@ -6490,23 +6490,3 @@ DiscountCondition:
             description: 'Condition parameters.'
             items:
                 type: object
-CollaborationSession:
-    type: object
-
-CollaborationSessionCreate:
-    type: object
-
-Participant:
-    type: object
-
-ParticipantList:
-    type: object
-
-ParticipantUpdate:
-    type: object
-
-InvitationCreate:
-    type: object
-
-Invitation:
-    type: object