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.
Use `.I' for normal emphasis and `.B' for strongest.
Use `Unix', not `UNIX'.
+ Use `user ID' and `group ID', not `user-id'.
Use `zeroed', not `zero'd'.
Use `mail drop', not `maildrop' or `drop box'.
Use `messages', not `message(s)', ditto `folders', etc.