[PATCH] maint: sort: remove the last uses of "'%s'" in diagnostics

There are still other uses of literal quotes (run this for a subset, git grep -h "\".*'.'.*\"" src ) but this is the only one with '%s'. There are also a few with %c: $ git grep -h "'%c'" src _("%s: closing delimiter '%c' missing"), str, delim); error (0, 0, _("invalid c

pr -S option arg

I notice that `pr -S` takes an optional arg, but the docs say it's required. Should I fix the docs or the code? cheers, Pádraig.