[whatwg/fetch] added note for `invalid` arg in `delete` (#397)

Added note to clarify as discussed in #372 
You can view, comment on, or merge this pull request online at:

  https://github.com/whatwg/fetch/pull/397

-- Commit Summary --

  * added note for `invalid` arg in delete

-- File Changes --

    M Overview.src.html (3)

-- Patch Links --

https://github.com/whatwg/fetch/pull/397.patch
https://github.com/whatwg/fetch/pull/397.diff

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