Re: [webrtc-pc] Refer to whatwg same-origin and current settings to define the certificate origin check (#2041)

Two notes:
- The concept of 'in the future' is not well defined. Not a big deal, but it would be nice to link to something more precise
- Store the certificate(s) is not clear either. This may have a potential effect on whether setting the configuration will throw if the certificates are not the same: is order of the certificates important, is it equality of certificate object that is tested or equality of certificate objects internal slots (say I serialize/deserialize a certificate, can I use the new one instead of the old one).

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