Editing of man/mhfixmsg.man.
Editing of man/mhfixmsg.man.

- 8bit -> 8-bit, nbit -> n-bit, except in flags and error msgs
- Add nmh to .SH NAME
- Formatting
- use .B for -outfile
- use .IR for mh-profile (5)
- sort SEE ALSO programs

mcr/nmh,mcr/nmh