[whatwg/streams] Added fetch-progress Examples to Demos (#890)

Added Stream progress indicator examples with explicit note to see browser support link to enable functionality in current Firefox version

https://fetch-progress.anthum.com/
You can view, comment on, or merge this pull request online at:

  https://github.com/whatwg/streams/pull/890

-- Commit Summary --

  * Added fetch-progress Examples to Demos

-- File Changes --

    M demos/index.html (3)

-- Patch Links --

https://github.com/whatwg/streams/pull/890.patch
https://github.com/whatwg/streams/pull/890.diff

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