Figure out what to do with unwanted line breaks

We have `` in various places to avoid getting arbitrary line breaks in the middle of command-line options, etc. However, [there's reason to believe](https://developer.mozilla.org/en-US/docs/Web/HTML/Element/nobr) that this element shouldn't be used; the correct way to do this in HTML seems to be ``.

In theory, maybe it's a code idea for fenced fragments to implicity do this via CSS. Currently, fenced fragments render as `` in HTML, and I don't see any `nowrap` option in the CSS (but my web foo is lacking). @nschonni @smitpatel any input here, or is there someone who would know?

Note: when this is done, remove all `` occurrences and also the current exemption in .markdownlint.json.