- as requested by ESR, remove the use of parentheses from the usage
summary, it confused some man page conversion tool he has
- updated documentation for the -p option to mention the word "role"
so anyone search for role in the man page will still find it
- removed use of .UC, it is listed as deprecated in all the current man
documentation I could find, when it was even documented at all
- other minor spelling and formatting (hyphenation) changes
