fix typo in sudoers sample file path

debian/aegir-provision.postinst

@@ -41,12 +41,12 @@ case "$1" in
         adduser --quiet aegir www-data
 
         if [ -d /etc/sudoers.d ]; then
-            ucf --debconf-ok /usr/share/doc/aegir-provision/examples/examples.sudoers /etc/sudoers.d/aegir
+            ucf --debconf-ok /usr/share/doc/aegir-provision/examples/example.sudoers /etc/sudoers.d/aegir
             ucfr aegir-provision /etc/sudoers.d/aegir
             chmod 440 /etc/sudoers.d/aegir
         else
             echo "running an older version of sudo"
-            echo "copy content of /usr/share/doc/aegir-provision/examples/examples.sudoers into /etc/sudoers for aegir to run properly"
+            echo "copy content of /usr/share/doc/aegir-provision/examples/example.sudoers into /etc/sudoers for aegir to run properly"
         fi
 
         # fix permissions on installed directories