[whatwg/xhr] Sort and lowercase header names in getAllResponseHeaders() example (#137)

Also add highlighting for code. Fixes #136.
You can view, comment on, or merge this pull request online at:

  https://github.com/whatwg/xhr/pull/137

-- Commit Summary --

  * Sort and lowercase header names in getAllResponseHeaders() example

-- File Changes --

    M xhr.bs (48)

-- Patch Links --

https://github.com/whatwg/xhr/pull/137.patch
https://github.com/whatwg/xhr/pull/137.diff

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