Add note about manifest expiry

[bangelic]

What changes are you introducing?

Adding a note to 2.5 Updating and refreshing
Red Hat subscription manifests that tells the user
the web UI notifies them when their subscription
manifest expires.
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Why are you introducing these changes? (Explanation, links to references, issues, etc.)

In reference to https://issues.redhat.com/browse/SAT-30326

Anything else to add? (Considerations, potential downsides, alternative solutions you have explored, etc.)

Checklists

• I am okay with my commits getting squashed when you merge this PR.
• I am familiar with the contributing guidelines.

Please cherry-pick my commits into:

• Foreman 3.14/Katello 4.16
• Foreman 3.13/Katello 4.15 (EL9 only)
• Foreman 3.12/Katello 4.14 (Satellite 6.16)
• Foreman 3.11/Katello 4.13 (orcharhino 6.11 on EL8 only; orcharhino 7.0 on EL8+EL9)
• Foreman 3.10/Katello 4.12
• Foreman 3.9/Katello 4.11 (Satellite 6.15; orcharhino 6.8/6.9/6.10)
• Foreman 3.8/Katello 4.10
• Foreman 3.7/Katello 4.9 (Satellite 6.14)
• We do not accept PRs for Foreman older than 3.7.

[github-actions]

The PR preview for ac7f5bc is available at theforeman-foreman-documentation-preview-pr-3686.surge.sh

The following output files are affected by this PR:

• Managing_Content/index-katello.html
• Managing_Content/index-orcharhino.html
• Managing_Content/index-satellite.html

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show diff as HTML

[aneta-petrova]

https://access.redhat.com/solutions/11101 (linked from the Jira) explains what's going on: why the manifest expiry warning appears in the web UI and how to address it. I'm wondering whether it would be better to add a link to the solution rather than a new note.