Update Domain schema object

`domain` property now accepts trailing periods.

Author: leslitagordita

openapi.yaml

@@ -13451,7 +13451,7 @@ components:
           x-linode-cli-display: 3
         domain:
           type: string
-          pattern: ([a-zA-Z0-9-_]{1,63}\.)+([a-zA-Z]{2,3}\.)?([a-zA-Z]{2,16}|xn--[a-zA-Z0-9]+)
+          pattern: ([a-zA-Z0-9-_]{1,63}\.)+([a-zA-Z]{2,3}\.)?([a-zA-Z]{2,16}|xn--[a-zA-Z0-9]+\.?)
           description: >
             The domain this Domain represents. Domain labels cannot be longer than
             63 characters and must conform to [RFC1035](https://tools.ietf.org/html/rfc1035).