Remove CDN SSL version

[bangelic]

The CDN SSL version was determined not to be needed in the content settings reference module. There is no mention of it in the documentation and if it was mentioned, it would have been removed.

• [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 3.12/Katello 4.14 (Satellite 6.16)
• [x] Foreman 3.11/Katello 4.13
• [x] Foreman 3.10/Katello 4.12
• [x] Foreman 3.9/Katello 4.11 (Satellite 6.15; orcharhino 6.8/6.9/6.10)
• [x] Foreman 3.8/Katello 4.10
• [x] Foreman 3.7/Katello 4.9 (Satellite 6.14)
• [x] Foreman 3.6/Katello 4.8
• [x] Foreman 3.5/Katello 4.7 (Satellite 6.13; orcharhino 6.6/6.7)
• We do not accept PRs for Foreman older than 3.5.

[github-actions[bot]]

The PR preview for 4f113fe17715dba3af9a76bf4a8c700aff81bd35 is available at theforeman-foreman-documentation-preview-pr-3299.surge.sh

The following output files are affected by this PR:

• Administering_Project/index-foreman-deb.html
• Administering_Project/index-foreman-el.html
• Administering_Project/index-katello.html
• Administering_Project/index-orcharhino.html
• Administering_Project/index-satellite.html

show diff

show diff as HTML

[maximiliankolb]

Merged to "master" and cherry-picked: 892036df87..43f3f1148d 3.12 -> 3.12 eae72742d8..ea9832c29b 3.11 -> 3.11

@bangelic Please let me know if you need cherry-picks to older releases.