[fetch] Clarify main fetch recursive invocation from redirect-fetch#217 (#218)

Specification on main fetch should clarify the role of a `recursive flag` in the invocation of main fetch from redirect fetch.

Please let me know if you have any comments or critiques!

Fixes: #217 
You can view, comment on, or merge this pull request online at:

  https://github.com/whatwg/fetch/pull/218

-- Commit Summary --

  * Clarify main fetch recursive invocation #217

-- File Changes --

    M Overview.html (13)

-- Patch Links --

https://github.com/whatwg/fetch/pull/218.patch
https://github.com/whatwg/fetch/pull/218.diff

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https://github.com/whatwg/fetch/pull/218