Fix appearance of links within code blocks

[vsalvino]

Links are still dark within code blocks, making them unreadable. This can happen from module reference generated from autodoc, e.g.

Before:

After:

[tbrlpld]

How can you have a working link the pre element? Shouldn't that render the markup? Weird

[tbrlpld]

If you have to display reserved characters such as <, >, &, " within the <pre> tag, the characters must be escaped using their respective HTML entity.

— https://developer.mozilla.org/en-US/docs/Web/HTML/Element/pre

[vsalvino]

I believe <pre> only preserves whitespace; it still allows other html tags within it, similar to a div.