(asciidoc) Unconstrained text formatting is not correctly highlighted

[ggrossetie]

Describe the issue

AsciiDoc supports constrained and unconstrained syntax. For instance, when using the bold syntax, you can mark a word or phrase as bold by enclosing it in a single set of asterisks (e.g., *word*) (constrained). You can mark bounded characters (i.e., characters within a word) as bold by enclosing them in a set of double asterisks (e.g., char**act**ers) (unconstrained).

Which language seems to have the issue?

asciidoc

Sample Code to Reproduce

bold **un**constrained text.

italic __un__constrained text.

monospace ``un``constrained text.

Expected behavior

It should produce the following result:

bold <span class="hljs-strong">**un**</span>constrained text.

italic <span class="hljs-emphasis">__un__</span>constrained text.

monospace <span class="hljs-code">``un``</span>constrained text.

Additional context

https://asciidoctor-docs.netlify.app/asciidoc/current/text/