[whatwg/dom] Link exposed to the WebIDL definition, remove potentially confusing note (PR #1391)

I recently implemented this, and noticed that this could be linked, so this does that. However, on deeper investigation, I did notice that browsers didn't behave as I expected for [DeviceMotionEvent](https://w3c.github.io/deviceorientation/spec-source-orientation.html#devicemotion) since that is only exposed in secure contexts.

I expected browsers for example to throw on `document.createEvent('devicemotionevent')` like they do for `new DeviceMotionEvent('foo')` in secure contexts, but from some limited testing they seem to not do that.

Since the intent of the spec is to throw, I'm just removing the spec note here which seems to indicate it only applies for TouchEvent and will write a corresponding WPT test if this change is fine.

Sidenote: [TouchEvent](https://w3c.github.io/touch-events/#idl-def-touchevent) by strict reading of the IDL is always exposed on window in the IDL definition and the spec instead uses a [separate implementation defined boolean](https://w3c.github.io/touch-events/#conditionally-exposing-legacy-touch-event-apis) which reads to only for the mixin, so this wouldn't apply here. But that seems to not reflect with the intent of the touch events spec, and now that specification is unmaintained.

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  https://github.com/whatwg/dom/pull/1391

-- Commit Summary --

  * Editorial: Link use of 'exposed' to the WebIDL definition

-- File Changes --

    M dom.bs (7)

-- Patch Links --

https://github.com/whatwg/dom/pull/1391.patch
https://github.com/whatwg/dom/pull/1391.diff

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