[whatwg/fetch] Editorial: Use "append" to modify the header list (#807)

Use "append" instead of "set" to modify the header list, improving
consistency (#758).

/cc @annevk @youennf 
You can view, comment on, or merge this pull request online at:

  https://github.com/whatwg/fetch/pull/807

-- Commit Summary --

  * Editorial: Use "append" to modify the header list

-- File Changes --

    M fetch.bs (6)

-- Patch Links --

https://github.com/whatwg/fetch/pull/807.patch
https://github.com/whatwg/fetch/pull/807.diff

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