[w3c/editing] [execCommand] fix: stop using HTMLDocument (#205)

There is no `HTMLDocument` IDL interface and those methods are now in `Document`, so this patch reflects the reality.
You can view, comment on, or merge this pull request online at:

  https://github.com/w3c/editing/pull/205

-- Commit Summary --

  * [execCommand] Stop using HTMLDocument

-- File Changes --

    M execCommand.html (41)

-- Patch Links --

https://github.com/w3c/editing/pull/205.patch
https://github.com/w3c/editing/pull/205.diff

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