[w3c/uievents] Declare `InputEvent.data` value of `insertLink` should be relative URI if it's specified as relative URI (#222)

Currently, `insertLink''s `data` value is declared as:

>  the url of the proposed link 

This is not clear whether this value can be relative URI or resolved to absolute URI even when relative URI is specified.

I think that the `data` value of `insertLink` should be any URI which is specified actually because:
- specified URI may be invalid.
- the document's URI may be data URI.
- web apps wants to resolve the given URI with different URI from the document's URI.

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https://github.com/w3c/uievents/issues/222