[w3c/IndexedDB] Remove WebIDL escaping of includes() method (#299)

"includes" was added to the WebIDL grammar to avoid needing escaping:

https://heycam.github.io/webidl/#prod-OperationName

Fixes #294

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

  https://github.com/w3c/IndexedDB/pull/299

-- Commit Summary --

  * Replace var with let/const in examples.
  * Unescape includes() method

-- File Changes --

    M index.bs (105)

-- Patch Links --

https://github.com/w3c/IndexedDB/pull/299.patch
https://github.com/w3c/IndexedDB/pull/299.diff

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