[fetch] Copy-editing changes; mostly adding hyphens. (#72)

Addresses #63.
You can view, comment on, or merge this pull request online at:

  https://github.com/whatwg/fetch/pull/72

-- Commit Summary --

  * Copy-editing changes; mostly adding hyphens.

-- File Changes --

    M Overview.src.html (182)

-- Patch Links --

https://github.com/whatwg/fetch/pull/72.patch
https://github.com/whatwg/fetch/pull/72.diff

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https://github.com/whatwg/fetch/pull/72