Highlight footnote-style hyperlinks.

As well as the traditional `[text](url)` syntax, Markdown allows the text to
be followed by a tag in square brackets. If the text is followed by nothing
at all, then the tag for that link is the text itself. The actual URL
is supplied later in the document, like a footnote at the bottom of the page:

	Some text with [a link][tag] and [another link].

	[tag]: http://www.example.com/link1
	[another link]: http://www.example.com/link2

This adds the "link" face to the URL in such footnote lines.

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