[w3c/IndexedDB] Replace abrupt completion asserts/returns with !? shortcuts from ES spec (#100)

Calling an abstract ECMAScript operation with ! prefix is equivalent to asserting it will never return an abrupt completion. Calling an abstract ECMAScript operation with ? prefix is equivalent to following the call with ReturnIfAbrupt(result).
You can view, comment on, or merge this pull request online at:

  https://github.com/w3c/IndexedDB/pull/100

-- Commit Summary --

  * Replace abrupt completion asserts/returns with !? shortcuts from ECMAScript spec

-- File Changes --

    M index.bs (79)
    M index.html (44)

-- Patch Links --

https://github.com/w3c/IndexedDB/pull/100.patch
https://github.com/w3c/IndexedDB/pull/100.diff

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