[whatwg/fetch] Add a missing "is" to 3.1 ("Origin header"). (#446)

Commit eb89fcd5 ("Remove request's omit-Origin-header flag") changed the
phrasing in section 3.1, but is missing a word in the note about the Origin
header.
You can view, comment on, or merge this pull request online at:

  https://github.com/whatwg/fetch/pull/446

-- Commit Summary --

  * Add a missing "is" to 3.1 ("Origin header").

-- File Changes --

    M fetch.bs (2)

-- Patch Links --

https://github.com/whatwg/fetch/pull/446.patch
https://github.com/whatwg/fetch/pull/446.diff

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