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 update to an existing topic

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

• [ ] We need a whole new section; this is a function not
  documented before and doesn't belong in any current section

• [ ] We need an Operator Advisory review and approval

• [ ] We need a z-Stream (Errata) Advisory and Release note
  for MCE and/or ACM

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/2.12/html/clusters/cluster_mce_overview#install-on-disconnected-networks
• Source: https://github.com/stolostron/rhacm-docs/blob/2.12_stage/clusters/install_upgrade/install_connected.adoc#installing-from-the-ocp-short-cli

4. - [x] Mandatory for GA content:

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

• [ ] *Add Required access level *(example, *Cluster
  Administrator*) for the user to complete the task:

• [ ] Add verification at the end of the task, how does the user
  verify success (a command to run or a result to see?)

• [ ] Add link to dev story here:

5. - [x] Mandatory for bugs: What is the diff? Clearly define what the
problem is, what the change is, and link to the current documentation. Only
use this for a documentation bug.

The MCE installation documentation refers to a non-existing channel stable-2.1 in its Subscription example. As far as I understand, it has to be stable-2.7. The existing example causes a failure:

  - message: 'constraints not satisfiable: no operators found in channel stable-2.1
      of package multicluster-engine in the catalog referenced by subscription multicluster-engine,
      subscription multicluster-engine exists'
    reason: ConstraintsNotSatisfiable
    status: "True"
    type: ResolutionFailed