Simplify anchors for Salt

[maximiliankolb]

What changes are you introducing?

Simplify anchors and xrefs in Salt docs

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.)

$ cat guides/doc-Managing_Configurations_Salt/master.adoc | rg common/modules
# commit & then run
$ git show | rg "^-" | rg "id=" | sort -u

I could like to keep the scope of this PR limited.

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 3.19/Katello 4.21
• Foreman 3.18/Katello 4.20 (Satellite 6.19)
• Foreman 3.17/Katello 4.19
• Foreman 3.16/Katello 4.18 (Satellite 6.18; orcharhino 7.6, 7.7, and 7.8)
• Foreman 3.15/Katello 4.17
• Foreman 3.14/Katello 4.16 (Satellite 6.17; orcharhino 7.4; orcharhino 7.5)
• We do not accept PRs for Foreman older than 3.14.

[github-actions]

The PR preview for 6d43fee is available at theforeman-foreman-documentation-preview-pr-5032.surge.sh

The following output files are affected by this PR:

• Managing_Configurations_Salt/index-foreman-deb.html
• Managing_Configurations_Salt/index-foreman-el.html
• Managing_Configurations_Salt/index-katello.html
• Managing_Configurations_Salt/index-orcharhino.html

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