Document help_center default and locales fields in Preview spec

descriptions/0/api.intercom.io.yaml

@@ -2780,6 +2780,9 @@ paths:
                     display_name: Intercom Help Center
                     url: https://help.mycompany.com
                     custom_domain: help.mycompany.com
+                    default: false
+                    locales:
+                    - en
               schema:
                 "$ref": "#/components/schemas/help_center"
         '404':
@@ -26437,6 +26440,18 @@ components:
           nullable: true
           description: Custom domain configured for the help center
           example: "help.mycompany.com"
+        default:
+          type: boolean
+          description: Whether this help center is the default for the workspace.
+          example: false
+        locales:
+          type: array
+          description: The locales in which the help center is available.
+          items:
+            type: string
+          example:
+          - en
+          - fr
     help_center_list:
       title: Help Centers
       type: object