Is this a bug? Is the < character supposed to change something in markdown? I didn't think so.
(Xcode 13.1)
Documentation comment "less than" character triggers monospace font?
I think that it is assuming that the < might be the start of an HTML tag or some other sort of markup meta-character. Anyways, I have found that you can escape it (prefix it with a backslash: "<" to fix the problem. It makes the comment uglier to read in the code, but fixes the documentation markup problem.