MANPAGE: fix alphabetical order and expand scryptn explaination
MANPAGE: fix alphabetical order and expand scryptn explaination

davesteele/gocryptfs,rfjakob/gocryptfs,davesteele/gocryptfs,davesteele/gocryptfs,rfjakob/gocryptfs,rfjakob/gocryptfs,rfjakob/gocryptfs