Add skip_notifications parameter to Update Ticket endpoint docs

The skip_notifications boolean parameter works on the Update Ticket
(PUT /tickets/{id}) endpoint but was missing from the OpenAPI specs.
This adds it to 2.13, 2.14, 2.15, and Unstable (0) using the same
allOf wrapper pattern used by Create Ticket.

Closes intercom/intercom#474395

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: levindixon

descriptions/0/api.intercom.io.yaml

@@ -14248,7 +14248,13 @@ paths:
         content:
           application/json:
             schema:
-              "$ref": "#/components/schemas/update_ticket_request"
+              allOf:
+              - "$ref": "#/components/schemas/update_ticket_request"
+              properties:
+                skip_notifications:
+                  type: boolean
+                  description: Option to disable notifications when a Ticket is updated.
+                  example: true
             examples:
               successful_response:
                 summary: Successful response

descriptions/2.13/api.intercom.io.yaml

@@ -12140,7 +12140,13 @@ paths:
         content:
           application/json:
             schema:
-              "$ref": "#/components/schemas/update_ticket_request"
+              allOf:
+              - "$ref": "#/components/schemas/update_ticket_request"
+              properties:
+                skip_notifications:
+                  type: boolean
+                  description: Option to disable notifications when a Ticket is updated.
+                  example: true
             examples:
               successful_response:
                 summary: Successful response

descriptions/2.14/api.intercom.io.yaml

@@ -13312,7 +13312,13 @@ paths:
         content:
           application/json:
             schema:
-              "$ref": "#/components/schemas/update_ticket_request"
+              allOf:
+              - "$ref": "#/components/schemas/update_ticket_request"
+              properties:
+                skip_notifications:
+                  type: boolean
+                  description: Option to disable notifications when a Ticket is updated.
+                  example: true
             examples:
               successful_response:
                 summary: Successful response

descriptions/2.15/api.intercom.io.yaml

@@ -13383,7 +13383,13 @@ paths:
         content:
           application/json:
             schema:
-              "$ref": "#/components/schemas/update_ticket_request"
+              allOf:
+              - "$ref": "#/components/schemas/update_ticket_request"
+              properties:
+                skip_notifications:
+                  type: boolean
+                  description: Option to disable notifications when a Ticket is updated.
+                  example: true
             examples:
               successful_response:
                 summary: Successful response