Bug 1894463

Describe the issue:
--------------------
Maintenance guide[1] of RHHI-V in section 3.4.3 explains about the creation of failover playbook, but it missed to explain about passwords.yml.

This inventory file passwords.yml is included in the playbook should contain the password for RHV Manager instance at the primary and secondary site. The content of playbook will be encrypted.

Contents of playbook should be:
<snip>
---
# This file is in plain text, if you want to
# encrypt this file, please execute following command:
#
# $ ansible-vault encrypt passwords.yml
#
# It will ask you for a password, which you must then pass to
# ansible interactively when executing the playbook.
#
# $ ansible-playbook myplaybook.yml --ask-vault-pass
#
dr_sites_primary_password: primary_password
dr_sites_secondary_password: secondary_password
</snip>

Add a note for the users to encrypt this file

<snip>
Note
For extra security you can encrypt the password file. However, you will need to use the --ask-vault-pass parameter when running the playbook. 
</snip>

Document URL:
-------------
[1] - https://access.redhat.com/documentation/en-us/red_hat_hyperconverged_infrastructure_for_virtualization/1.8/html-single/maintaining_red_hat_hyperconverged_infrastructure_for_virtualization/index#config-backup-recovery-failover-playbook

Chapter/Section Number and Title:
---------------------------------
Section 3.4.3 Creating a failover playbook between source and target clusters

Any other versions of this document that also needs this update:
-----------------------------------------------------------------
RHHI-V 1.7 Maintenance guide too