Update configuration file example to be compatible with tutorial

slapos.cfg.example

@@ -2,21 +2,22 @@
 software_root = /opt/slapgrid
 instance_root = /srv/slapgrid
 master_url = https://slap.vifib.com/
-computer_id = your computer id
-buildout = /path/to/buildout/binary
+# Replace computer_id by the unique identifier of your computer on vifib.net,
+# starting by COMP-
+computer_id = COMP-12345
+key_file = /etc/opt/slapos/key
+cert_file = /etc/opt/slapos/certificate
+certificate_repository_path = /etc/opt/slapos/pki/
 
 [slapformat]
+# Replace by your network interface like eth0, eth1, slapbr0...
+interface_name = interfacename
 computer_xml = /opt/slapos/slapos.xml
 log_file = /opt/slapos/slapformat.log
-partition_amount = 200
-interface_name = br0
+partition_amount = 20
 partition_base_name = slappart
 user_base_name = slapuser
 tap_base_name = slaptap
+# You can choose any other local network which does not conflict with your
+# current machine configuration
 ipv4_local_network = 10.0.0.0/16
-
-[slapproxy]
-host = 127.0.0.1
-port = 5000
-# You could also specify: /path/to/file
-database_uri = :memory: