doc: mention cc-ing nodejs/url team for reviews

Add the nodejs/url github team to the table of people to /cc for
reviews on the WHATWG URL code.

PR-URL: https://github.com/nodejs/node/pull/10652


Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Joyee Cheung <joyeec9h3@gmail.com>
Reviewed-By: Jeremiah Senkpiel <fishrock123@rocketmail.com>
Reviewed-By: Gibson Fahnestock <gibfahn@gmail.com>