reedperkins

I noticed an error in the ruby example for [associating an authenticated domain with a subuser](https://www.twilio.com/docs/sendgrid/api-reference/domain-authentication/associate-an-authenticated-domain-with-a-subuser-multiple#associate-an-authenticated-domain-with-a-subuser-for-up-to-five-domains). Currently, line 10 reads: ```ruby response = sg.client.whitelabel.domains._(domain_id).subuser:add.post(request_body: data) ``` The colon in `subuser:add`...