fix hosts template

Student User

2020-02-19 26d781da63ad0368921d6a0eb1f5efcb9bc479d1

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---
- name: demo of magic var
  hosts: servera
  become: true
  tasks:
    - name: "write inventory data to file"
      copy:
        dest: /inventory-file
        content: '{{ groups | to_pretty_json }}'