Update ansible.md (#4599)

Ansible 2.0 has deprecated the “ssh” from ansible_ssh_host.

Updating the docs to be more aligned with the Ansible version used in the sample/inventory.ini file as well.
Also adding `[bastion]` group in the docs to avoid confusion.

docs/ansible.md

@@ -35,12 +35,12 @@ Below is a complete inventory example:
 ```
 ## Configure 'ip' variable to bind kubernetes services on a
 ## different ip than the default iface
-node1 ansible_ssh_host=95.54.0.12 ip=10.3.0.1
-node2 ansible_ssh_host=95.54.0.13 ip=10.3.0.2
-node3 ansible_ssh_host=95.54.0.14 ip=10.3.0.3
-node4 ansible_ssh_host=95.54.0.15 ip=10.3.0.4
-node5 ansible_ssh_host=95.54.0.16 ip=10.3.0.5
-node6 ansible_ssh_host=95.54.0.17 ip=10.3.0.6
+node1 ansible_host=95.54.0.12 ip=10.3.0.1
+node2 ansible_host=95.54.0.13 ip=10.3.0.2
+node3 ansible_host=95.54.0.14 ip=10.3.0.3
+node4 ansible_host=95.54.0.15 ip=10.3.0.4
+node5 ansible_host=95.54.0.16 ip=10.3.0.5
+node6 ansible_host=95.54.0.17 ip=10.3.0.6
 
 [kube-master]
 node1
@@ -175,7 +175,8 @@ simply add a line to your inventory, where you have to replace x.x.x.x with the
 bastion host.
 
 ```
-bastion ansible_ssh_host=x.x.x.x
+[bastion]
+bastion ansible_host=x.x.x.x
 ```
 
 For more information about Ansible and bastion hosts, read