Re: [touch-events] Dangling sentence in touchcancel is confusing (#35)

Proposed change:

```A user agent may non-document area which is capable of handling user interactions (e.g. the UA's native user interface, or an area of the document which is managed by a plug-in). A user agent```

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https://github.com/w3c/touch-events/issues/35#issuecomment-150947646