[heycam/webidl] Drop stringifier operation longhand (#941)

A search by `stringifier\s+DOMString` in [webref](https://github.com/w3c/webref) says [Selection API](https://w3c.github.io/selection-api/#selection-interface) is the only spec using it in the form of `stringifier DOMString ();`, which is just same as `stringifier;`.

Closes #816 
You can view, comment on, or merge this pull request online at:

  https://github.com/heycam/webidl/pull/941

-- Commit Summary --

  * Drop stringifier operation longhand

-- File Changes --

    M index.bs (57)

-- Patch Links --

https://github.com/heycam/webidl/pull/941.patch
https://github.com/heycam/webidl/pull/941.diff

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