Fix 404 and 403 error response examples

Add proper error.list examples for error responses to fix Swagger validation.

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

Author: thibault-intercom

descriptions/0/api.intercom.io.yaml

@@ -9792,12 +9792,28 @@ paths:
           description: Workflow not found
           content:
             application/json:
+              examples:
+                Workflow not found:
+                  value:
+                    type: error.list
+                    request_id: b3c8c472-8478-4f10-a29e-a23dbf921c46
+                    errors:
+                    - code: not_found
+                      message: Workflow not found
               schema:
                 "$ref": "#/components/schemas/error"
         '403':
           description: Workflow export is not available for this app
           content:
             application/json:
+              examples:
+                Feature not available:
+                  value:
+                    type: error.list
+                    request_id: d92f7e84-5c31-4a2b-b8e6-9f4c3d2a1b0e
+                    errors:
+                    - code: api_plan_restricted
+                      message: Workflow export is not available for this app
               schema:
                 "$ref": "#/components/schemas/error"
   "/download/content/data/{job_identifier}":