update description

reference/webhooks.v3.yml

@@ -3038,7 +3038,7 @@ components:
         destination:
           type: string
           example: 'https://665b65a6.ngrok.io/webhooks'
-          description: 'URL must be active, return a 200 response, and be served on port 443 (custom ports not currently supported).'
+          description: URL must be active, return a 200 response, and be served on port 443. Custom ports arenʼt currently supported.
         is_active:
           type: boolean
           example: true
@@ -3049,8 +3049,9 @@ components:
           description: Boolean value that identifies whether events are stored that could not be received.
         headers:
           type: object
-          description: 'Headers used to validate that webhooks are active. You can pass in any number of custom headers to validate webhooks are being returned. '
+          description: Headers used to validate that webhooks are active. You can pass in any number of custom headers to validate webhooks are being returned.
           nullable: true
+          properties: {}
           additionalProperties:
             type: string
     webhook_Base: