[whatwg/fetch] Editorial: use Infra maps for dictionaries (#794)

And linkify TypeError.

Fixes #513.
You can view, comment on, or merge this pull request online at:

  https://github.com/whatwg/fetch/pull/794

-- Commit Summary --

  * Editorial: use Infra maps for dictionaries

-- File Changes --

    M fetch.bs (172)

-- Patch Links --

https://github.com/whatwg/fetch/pull/794.patch
https://github.com/whatwg/fetch/pull/794.diff

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