Update example playbook call.

playbooks/edx-east/deployer.yml

-# ansible-playbook -c ssh -vvvv --user=ubuntu -i ec2.py deployer.yml -e "@gh_users.yml" -e "@/path/to/secure/ansible/vars/hotg.yml" -e "@/path/to/configuration-secure/ansible/vars/common/common.yml" --limit="tag_aws_cloudformation_stack-name_<admin_stack_name>"
+# ansible-playbook -c ssh -vvvv --user=ubuntu -i ec2.py deployer.yml -e "@/path/to/secure/ansible/vars/edx_admin.yml" --limit="tag_aws_cloudformation_stack-name_<admin_stack_name>"
 # You will need to create a gh_users.yml that contains the github names of users that should have login access to the machines.
 # Setup user login on the bastion
 - name: Configure Bastion