[whatwg/streams] Fix indentation in append-child.html demo (#750)

The options passed to the fetch() statement in append-child.html were
misaligned. Fixed.
You can view, comment on, or merge this pull request online at:

  https://github.com/whatwg/streams/pull/750

-- Commit Summary --

  * Fix indentation in append-child.html demo

-- File Changes --

    M demos/append-child.html (12)

-- Patch Links --

https://github.com/whatwg/streams/pull/750.patch
https://github.com/whatwg/streams/pull/750.diff

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https://github.com/whatwg/streams/pull/750