Crystal: Non-existing links generated in docs when using required classes in alias

[r00ster91]

Generating docs for

require "colorize"

struct Colorize::Object
end

alias Alias = Colorize

results in:

When clicking on Object, it leads me to a non-existing page.

Similar bug:

Generating docs for

require "colorize"

struct Colorize::Object
end

alias Alias = Colorize::Object

results in:

Clicking on Colorize::Object(T) leads me to a non-existing page.

Non-existing page links are also generated when having `Colorize` / `Colorize::Object` in the documentation of for example a method.

[asterite]

I can take a look at this.