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The doc text looks good for me. 

We will start to test it when the scratch build is rady, according the PR, we can check the deprecation warning by:
1). man virt-who-config
2). when /etc/sysconfig/virt-who is used, deprecated warning message will be found in /var/log/rhsm.log.

clearing the need info fag . As the additional request in comment 3 has already been provided.

Have made the docs update in the following places:
RHSM release notes: https://access.redhat.com/articles/3322541
Configuring Virtual Machines in RHSM: https://access.redhat.com/documentation/en-us/red_hat_subscription_management/1/html-single/configuring_virtual_machine_subscriptions_in_red_hat_subscription_management/index?lb_target=production#configuring-virt-who (important note in the  top of chapter 4)

Please let me know if there is anything else I can do.

@Anni, 
I just noticed we should mark which major release will be deprecated, so a little change as below:

The use of environment variables and the use of the sysconfig file to configure virt-who are deprecated. Their use will be ignored in the next major release(RHEL-9).

That has been added.

Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory (virt-who bug fix and enhancement update), and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

https://access.redhat.com/errata/RHBA-2021:1749