[uievents] Don't list modifier keys in the uievents spec (link to uievents-key instead) (#69)

_From @garykac on February 26, 2016 18:38_

In https://w3c.github.io/uievents/#event-constructors, there is a list of modifier keys -- all of them except the 4 that have special xxxKey flags.

Rather than enumerating them here, there should be a link to https://w3c.github.io/uievents-key/#keys-modifier.



_Copied from original issue: w3c/uievents-key#15_

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https://github.com/w3c/uievents/issues/69