[w3c/uievents] Drop "Sent only if the DOM was updated." from 5.7.6. Input Events During Composition (#269)

[5.7.6. Input Events During Composition](https://w3c.github.io/uievents/#events-composition-input-events) says

> The beforeinput and input events are sent along with the compositionupdate event whenever the DOM is updated as part of the composition. Since there are no DOM updates associated with the compositionend event, beforeinput and input events should not be sent at that time.

and

> Sent only if the DOM was updated. 

However, `input` event should be fired for notifying ending composition because if browsers do so, web apps don't need to manage composing state with `compositionstart` and `compositionend`. (See also #220) And Input Events Level 2 is designed for that with new `inputType` value, `"insertFromComposition"`. So, I think that the first quotation can be dropped. And the latter can be written with "Sent only if the `beforeinput` is not canceled`.

Note that browsers currently send `input` events at committing composition with same string.

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