fix: some minor comment and type correction. @minor

precise/mirror/hooks/install

@@ -18,6 +18,7 @@ useradd -r rsync -d /var/lib/rsync -g rsync
 
 chown rsync:rsync /var/lib/rsync
 
+## build silently a key for 'rsync' user:
 su -c 'ssh-keygen -t rsa -N "" -f ~/.ssh/id_rsa -q' - rsync
 
 ## /etc/sudoers