Yet, that chapter still features gdb (and only gdb) throughout. I think it should be rewritten to feature lldb instead (or perhaps both). I can't suggest language at this time, though, because I need to learn the basics of lldb first.
Are there architectures and/or supported versions where gdb is still the default FreeBSD debugger? I'm unsure whether lldb should be added to it, or replace it altogether.
Ed might have some insight into what can/ought to be done that could inform doc changes
Based on an IRC discussion with kevans91 and debdrup, I'll add lldb and leave gdb in since I'm told it's still the recommended tool (adding a mention to get it from ports/pkg if not available in base), unless someone tells me otherwise before I get a round tuit.