[whatwg/fetch] Editorial: weird invocations of header list's append (#942)

* https://fetch.spec.whatwg.org/#ref-for-concept-header-list-append%E2%91%A1%E2%93%AA
* https://fetch.spec.whatwg.org/#ref-for-concept-header-list-append%E2%91%A1%E2%91%A0
* https://fetch.spec.whatwg.org/#ref-for-concept-header-list-append%E2%91%A1%E2%91%A3

These should all be updated to use the pair syntax we use elsewhere and not say that the header name is appended to its value in some list...

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