update README to contain full example

README.md

@@ -6,19 +6,17 @@ On server
 virt-install-debian srvXXX
 ```
 
+* press <strg>+5 to disconnect from the console once the boostrapping is finished, be patient before the next step
+* confirm succesfull creation with <y>-key
+
 Chef Bootstrapping (On Your Workstation)
 ========================================
 
+* make sure you are connected to the VPN
 * When bootstrapping a publicly reachable VM
 ```shell
     knife bootstrap --bootstrap-version 12.5.1 -E production -r "recipe[t3-base]" --ssh-user=root \
-     -N srvXXX.typo3.org 46.4.xxx.yyy
-```
-
-* When bootstrapping a VM in the private network:
-```shell
-    knife bootstrap --bootstrap-version 12.5.1 -E production -r "recipe[t3-base]" --ssh-gateway username@msXX.typo3.org \
-      -N srvXXX.typo3.org 10.186.2.xx
+     -N srvXXX.typo3.org 10.186.2.yyy
 ```
 
 Customisation of virtual machine