Describe the default behaviour, then how it can be altered,
e.g. an option.
It's `see foo(1)', not `see the foo(1) man page for more detail'.
+ Emails have `From' and `Date' headers, not `From:' and `Date:'.
+ An mbox-format file has `"From "' envelope-address headers.
A hyphen is input as an ASCII minus sign, `non-standard',
not as `\-' which is the input to output a minus sign.