[heycam/webidl] Minor fixups to creating an operation Function (#232)

- Wrap it in <div algorithm>
- Return |F|
- Use |op| appropriately

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Separated from https://github.com/heycam/webidl/pull/217. Use ?w=1 appended to this PR's URL to view changes without whitespace.
You can view, comment on, or merge this pull request online at:

  https://github.com/heycam/webidl/pull/232

-- Commit Summary --

  * Minor fixups to creating an operation Function

-- File Changes --

    M index.bs (97)
    M index.html (124)

-- Patch Links --

https://github.com/heycam/webidl/pull/232.patch
https://github.com/heycam/webidl/pull/232.diff

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https://github.com/heycam/webidl/pull/232