[w3c/FileAPI] Further integrate MediaSource documentation (#115)

This removes a note about extensibility and adds a few MediaSource references.
You can view, comment on, or merge this pull request online at:

  https://github.com/w3c/FileAPI/pull/115

-- Commit Summary --

  * further integrate MediaSource

-- File Changes --

    M index.bs (17)

-- Patch Links --

https://github.com/w3c/FileAPI/pull/115.patch
https://github.com/w3c/FileAPI/pull/115.diff

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https://github.com/w3c/FileAPI/pull/115