Note: Doc team updates the current version of the documentation and the
two previous versions (n-2), but we address *only high-priority, or
customer-reported issues* for -2 releases in support.
Describe the changes in the doc and link to your dev story:

1. - [ X] Mandatory: Add the required version to the Fix version/s field.

2. - [ ] Mandatory: Choose the type of documentation change or review.

• [X] We need to add a new document to an existing section

3. - [X] *Mandatory: *Use the following link to open the doc and find where the
documentation update should go. Note: As the feature and doc is
understood and developed, this placement decision may change:

• Published doc: https://docs.redhat.com/en/documentation/red_hat_advanced_cluster_management_for_kubernetes/2.11/html-single/clusters/index#add-host-host-inventory
• Source: https://github.com/stolostron/rhacm-docs/blob/f8fdeabc25525997de29ba160d76f2f6d6d97768/clusters/cluster_lifecycle/cim_add_host.adoc

4. - [ ] Mandatory for GA content:

• [X] Add steps, the diff, known issue, and/or other important
  conceptual information in the following space:

The documentation is not thorough around the possible options for the discovery ISO.

The UI download link automatically encodes the minimal.iso in the URL, so this is the one the user gets by default.

The minimal.iso does not contain the full rootfs.  This makes it easier and faster to transport across a network.  However, as a result of the changes applied to make it lightweight, it is less compatible with systems, especially older ones.  It strips the UEFI secondary partition that some older bootloaders are looking for.  Older systems may still make use of the full.iso file, but we need to let users know it is possible.