[whatwg/fetch] Add RequestInit members to Request domintro (#620)

This PR adds the RequestInit members to the Request domintro box. I wasn't sure if I should be linking to the enums for things like RequestInit.{mode, credentials, etc} to make it easy for people to see the actual valid values of objects or not, so if that is necessary I'll adjust this for sure.

There are also a couple misc wording fixes I made for the lower content I added in an earlier PR.
You can view, comment on, or merge this pull request online at:

  https://github.com/whatwg/fetch/pull/620

-- Commit Summary --

  * Add RequestInit members to Request domintro

-- File Changes --

    M fetch.bs (61)

-- Patch Links --

https://github.com/whatwg/fetch/pull/620.patch
https://github.com/whatwg/fetch/pull/620.diff

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