Dart docs for library don't allow CTRL + Click

[FMorschel]

Dart docs above library have a problem, see the following code:

/// This doc mentions everything [math], [Class], [function], [variable], 
/// [getter] and [setter].
library;

/// Here is a doc for [math]
import 'dart:math' as math;

/// Here is a doc for [Class] 
class Class {}

/// Here is a doc for [function]
void function() {}

/// Here is a doc for [variable]
int? variable;

/// Here is a doc for [getter]
int get getter => 0;

/// Here is a doc for [setter]
set setter(int value) {}

For every doc here we can CTRL + Click to go to the definition but that doesn't work on the docs above library.

CC @srawlins @DanTup

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Somewhat related to #47553.