Custom SSL certificate process for Capsules clarification

[rh-max]

What changes are you introducing?

Procedure clarifications for SSL certs for Capsules.

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

https://issues.redhat.com/browse/SAT-22614

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:

• [ ] Foreman 3.15/Katello 4.17
• [ ] Foreman 3.14/Katello 4.16 (Satellite 6.17)
• [ ] Foreman 3.13/Katello 4.15 (EL9 only)
• [ ] Foreman 3.12/Katello 4.14 (Satellite 6.16; orcharhino 7.2 on EL9 only)
• [ ] Foreman 3.11/Katello 4.13 (orcharhino 6.11 on EL8 only; orcharhino 7.0 on EL8+EL9; orcharhino 7.1 with Leapp)
• [ ] Foreman 3.10/Katello 4.12
• [ ] Foreman 3.9/Katello 4.11 (Satellite 6.15; orcharhino 6.8/6.9/6.10)
• We do not accept PRs for Foreman older than 3.9.

[github-actions[bot]]

The PR preview for 825706c63e1aea2dfb823ec9b110c4f5de24db2c is available at theforeman-foreman-documentation-preview-pr-3940.surge.sh

The following output files are affected by this PR:

• Installing_Proxy/index-katello.html
• Installing_Proxy/index-satellite.html

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show diff as HTML

[maximiliankolb]

triage: @rh-max Please ping someone for tech review & apply Lena's suggestions.

[aneta-petrova]

Moving to draft while we look for a new owner.