Re: [touch-events] Added legacy method initTouchEvent (#47)

Sorry, noticed a couple other little issues:
 - Remove "is not standardized and" from the note.  Including this API in the spec means it IS standardized.
 - Unfortunately we have to use distinct argument names (`unused1', `unused2', ...).  Unfortunately argument names are [required](http://heycam.github.io/webidl/#proddef-OptionalOrRequiredArgument) and [cannot be duplicated](http://heycam.github.io/webidl/#idl-operations).
 - Remove "this section is non-normative".  We're defining an API, so that must be normative (the default for this spec).

To make additional updates easier, feel free to leave inserting the commit link until after we merge this PR (sorry I was wrong).

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https://github.com/w3c/touch-events/pull/47#issuecomment-161721587