[whatwg/fetch] Clarify that credentials include HTTP auth (#616)

Fixes #612.
You can view, comment on, or merge this pull request online at:

  https://github.com/whatwg/fetch/pull/616

-- Commit Summary --

  * Clarify that credentials include HTTP auth

-- File Changes --

    M fetch.bs (6)

-- Patch Links --

https://github.com/whatwg/fetch/pull/616.patch
https://github.com/whatwg/fetch/pull/616.diff

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