feat(http): Add Sec-WebSocket-* headers

[bsmth]

Adding data in for Sec-WebSocket-* headers. I am copying over info from api.WebSocket.protocol_rfc_6455 ->

browser-compat-data/api/WebSocket.json

Line 673 in 7f9f083

"protocol_rfc_6455": {

Test results and supporting details

I began testing using BrowserStack, but support goes so far back, it's probably easier to mirror the rfc_6455 compliance entry instead.

Other changes:

• typo fixes in parallel

Related issues and pull requests

• chore(http): Refresh headers r-s content#36590

[caugner]

@bsmth We discussed the failing check in yesterday's BCD call, and the recommendation is to file an issue in w3c/browser-specs to add this RFC.

[bsmth]

Changes to browser-specs incoming in next release:

• Add The WebSocket Protocol w3c/browser-specs#1575

[caugner]

LGTM, and copying from RFC 6455 compliance is plausible, but I would prefer to extract the unrelated fixes to a separate PR (it'll be a no-brainer to approve).