Updated reference guide docs for the new pages introduced for scap management

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Description

This is kinda second part of https://github.com/uyuni-project/uyuni-docs/pull/4840/changes and is around reference guide.

Target branches

• Which product version this PR applies to (Uyuni, MLM 5.2). This information can be helpful if ifeval statements are needed to publish it for certain products only.
• Does this PR need to be backported? If yes, create an issue for tracking it and add the link to this PR.
• Whenever possible, cross-reference each backport PR here, so that all backports can be easily accessed from the description.

Backport targets (edit as needed):

• master
• 5.2

Links

• This PR tracks issue #<insert spacewalk issue, if any>
• Related development PR #<insert PR link, if any>