Correct media umount path

[ekohl]

What changes are you introducing?

Why are you introducing these changes? (Explanation, links to references, issues, etc.)

Since c140d0890eac01643fa945d987fa11559341ae31 the directory is /media/rhel and not /media/rhel8.

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

Checklists

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

Please cherry-pick my commits into:

• [x] Foreman 3.14/Katello 4.16
• [x] Foreman 3.13/Katello 4.15 (EL9 only)
• [x] Foreman 3.12/Katello 4.14 (Satellite 6.16; orcharhino 7.2 on EL9 only)
• [x] Foreman 3.11/Katello 4.13 (orcharhino 6.11 on EL8 only; orcharhino 7.0 on EL8+EL9; orcharhino 7.1 with Leapp)
• [x] Foreman 3.10/Katello 4.12
• [x] 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[bot]]

The PR preview for 207884a1af10d8815e7ffae6e491c78932b711e7 is available at theforeman-foreman-documentation-preview-pr-3864.surge.sh

The following output files are affected by this PR:

• Installing_Server_Disconnected/index-satellite.html

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show diff as HTML

[ekohl]

Anything holding back merging this?

[maximiliankolb]

Merged to "master" and cherry-picked: 9893aa00b2..421955486d 3.15 -> 3.15 e3b1e8f82a..e34f622fb6 3.14 -> 3.14 e355b71313..b9b5971109 3.13 -> 3.13 3e8a94b35a..500954aa86 3.12 -> 3.12 614e01214e..5ae57d8a4d 3.11 -> 3.11 af4b307cba..13806049ff 3.10 -> 3.10 67d758fe69..8bced9cc23 3.9 -> 3.9