tools,doc: better manpage refs
Minor doc cleanup to make the doctool emit manpage references in more cases where it’s appropriate:
- tools: use better regexp for manpage references:
In practice, manpage names may contain dots (e.g.
resolv.conf(5)
)but can only have a section in the range 1–9 as opposed to 0–9. - doc: remove backtick escaping for manpage refs: Removing backticks will make the doctool emit links to the man pages.