fix(highlights): link to more relevant groups

[justinmk]

• @text.literal seems appropriate for a codespan/codeblock.
• optionlink and taglink should use the same highlight.

[clason]

could add uri (link to @text.uri)

[justinmk]

is there anything for codeblock ? or is it also just @text.literal ?

[clason]

Ideally, we'll use an injection for that, anyway ;) In the meantime, we could also use a custom capture (@text.example or @text.codeblock)?

Otherwise, @text.literal sounds to me like the best option as well.