Doc references with prefixes do not resolve

[sethladd]

Considering this code:

library foo;

String foo = 'hi';

and

library bar;

import 'foo.dart' as foo;

/// Testing [foo.foo]
class Bar {

}

Expected: the Testing comment should have a link to foo

Actual: no link is generated. Our current logic can't handle a prefixed name inside of a doc reference.

[sethladd]

For now, we wrap prefixed names inside a <code> block, inside of a link, as a workaround.

[sethladd]

@keertip is this something we should support?

[keertip]

The doc reference resolution is done by the analyzer and dartdoc uses that information to generate the links. So if the analyzer cannot resolve the link, not much dartdoc can do there.

[jcollins-g]

Replaced with #1402