Document URL:

Enabling multipathing with kernel arguments on RHCOS
https://docs.openshift.com/container-platform/4.7/post_installation_configuration/machine-configuration-tasks.html#rhcos-enabling-multipath_post-install-machine-configuration-tasks

Describe the issue:

In the following BZ, the engineering team commented that multipath cannot be used in environments upgraded from 4.6 or earlier.

Bug 2094726 - Does bare-metal support multi-path configuration of the boot area?

>We do not support turning on multipath day-2 on nodes that have been upgraded from 4.6 or earlier.

However, the documentation says the following in the prerequisites, which is incorrect.

```
Prerequisites
You have a running OpenShift Container Platform cluster that uses version 4.7 or later.

You are logged in to the cluster as a user with administrative privileges.
```

Suggestions for improvement:
It should state that environments upgraded from 4.6 or earlier are not supported and the machine must be rebuilt.