fix: some minor comment and type correction. @minor

precise/mirror/hooks/install

@@ -7,7 +7,7 @@ set -eux # -x for verbose logging to juju debug-log
 ## kal-manage provides the script /usr/lib/kal/dusk/sbin/ssh-cmd-validate
 ## used to validate any entrant connection to SSH.
 
-apt-get install -y --force-yes rsync kal-manage 
+apt-get install -y --force-yes rsync kal-manage
 
 
 mkdir -p /var/mirror
@@ -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