Re: [selection-api] Clarify selectstart event behaviour (#50)

I've updated the sentence so that now it reads as follows:
> When the user agent is about to associate a new range newRange to the selection in response to a user initiated action, the user agent must fire ([DOM4]) an event with the name selectstart, which bubbles and is cancelable, at the node associated with the boundary point of newRange's start prior to changing the selection if the selection was previously empty or the previously associated range was collapsed.

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https://github.com/w3c/selection-api/issues/50#issuecomment-130498056