man: always supply quotes around literals When manpages are displayed on a terminal, <literal>s are indistinguishable from surrounding text. Add quotes everywhere, remove duplicate quotes, and tweak a few lists for consistent formatting. https://bugzilla.redhat.com/show_bug.cgi?id=874631

man,html: say 'systemd 198' in the header This should help readers of the man or HTML pages know if the documentation is out of date. An alternative to use a date generated from 'git log' was considered, but since we try to keep user visible documentation up to date, showing the project version should be enough.

man: strip the comments in man page headers They contained the date, which creates a problem with multiarch packages, since the generated file would be different each time.