Update manpage

src/freedombone

   echo '  -h --help             Show help'
   echo '     --bbb              Installing on Beaglebone Black'
   echo '  -u --user             User to install the system as'
-  echo '  -d --domain           Domain name'
+  echo '  -d --domain           Default domain name'
   echo '  -s --system           System type'
   echo '     --ip               Static LAN IP address of the system'
   echo '     --iprouter         LAN IP address of the internet router'
   echo '     --ddnsuser         Dynamic DNS provider username'
   echo '     --ddnspass         Dynamic DNS provider password'
   echo ''
-  echo '  -c --code             FreeDNS code'
+  echo '  -c --code             Default domain FreeDNS code'
   echo '     --microblogcode    Microblog FreeDNS code'
   echo '     --wikicode         Wiki FreeDNS code'
   echo '     --owncloudcode     Owncloud FreeDNS code'