Fix errors in manpage spotted by marco.
Fix errors in manpage spotted by marco.

rxcomm/mixminion,reezer/mixminion,mixminion/mixminion,reezer/mixminion,nmathewson/mixminion,nmathewson/mixminion,crooks/mixminion,nmathewson/mixminion,Javex/mixminion,mixminion/mixminion,crooks/mixminion,Javex/mixminion,crooks/mixminion,reezer/mixminion,reezer/mixminion,Javex/mixminion,mixminion/mixminion,Javex/mixminion,mixminion/mixminion,nmathewson/mixminion,crooks/mixminion,rxcomm/mixminion,rxcomm/mixminion,rxcomm/mixminion