[whatwg/fetch] Make observability examples nitpick-proof (#642)

Also clean up some editorial issues with that section in general.

Fixes #625.
You can view, comment on, or merge this pull request online at:

  https://github.com/whatwg/fetch/pull/642

-- Commit Summary --

  * Make observability examples nitpick-proof

-- File Changes --

    M fetch.bs (9)

-- Patch Links --

https://github.com/whatwg/fetch/pull/642.patch
https://github.com/whatwg/fetch/pull/642.diff

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