Update docs on checking Leapp results

[aneta-petrova]

What changes are you introducing?

• Removing a note about Leapp results being missing from the new page
• (TBD) Updating instructions on how to view Leapp results on the new page

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

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

Contributor 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 3.17/Katello 4.19
• Foreman 3.16/Katello 4.18 (Satellite 6.18; orcharhino 7.6)
• Foreman 3.15/Katello 4.17
• Foreman 3.14/Katello 4.16 (Satellite 6.17; orcharhino 7.4; orcharhino 7.5)
• Foreman 3.13/Katello 4.15 (EL9 only)
• Foreman 3.12/Katello 4.14 (Satellite 6.16; orcharhino 7.2 on EL9 only; orcharhino 7.3)
• We do not accept PRs for Foreman older than 3.12.

[github-actions]

The PR preview for 8eafd69 is available at theforeman-foreman-documentation-preview-pr-4591.surge.sh

The following output files are affected by this PR:

• Managing_Hosts/index-foreman-el.html
• Managing_Hosts/index-foremanctl-katello.html
• Managing_Hosts/index-foremanctl-orcharhino.html
• Managing_Hosts/index-foremanctl-satellite.html
• Managing_Hosts/index-katello.html
• Managing_Hosts/index-orcharhino.html
• Managing_Hosts/index-satellite.html

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