[fetch] "For each protocol in protocols, combine `Sec-We..." (#240)

https://fetch.spec.whatwg.org/#websocket-opening-handshake

> For each protocol in protocols, combine \`Sec\-WebSocket\-Protocol\`/protocol\.

This should specify that it combines them in (to?) request's header list. Right now it doesn't specify which header list.

---
Reply to this email directly or view it on GitHub:
https://github.com/whatwg/fetch/issues/240