OPCT-263: docs/cli: review cmd adm baseline with changes from #113

[mtulio]

What this PR does / why we need it:

Review the command adm baseline with more details and examples.

This PR decomposes changes from #113

Which issue(s) this PR fixes

https://issues.redhat.com/browse/OPCT-263

Checklist

• Subject and description added to both, commit and PR.
• Relevant issues have been referenced.
• This change includes docs.
• This change includes unit tests.

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[Copilot]

PR Overview

This PR updates the documentation for the "adm baseline" command, clarifying usage, examples, and available subcommands.

• Updated command header to include [actions].
• Revised command descriptions and examples for better clarity.
• Added an overview section for available subcommands with corresponding usage examples.

Reviewed Changes

File	Description
docs/opct/adm/baseline.md	Updated command header, descriptions, and examples to clarify usage of the adm baseline command.

Copilot reviewed 1 out of 1 changed files in this pull request and generated 3 comments.

Comments suppressed due to low confidence (1)

docs/opct/adm/baseline.md:81

• [nitpick] Consider modifying 'a latest artifact' to 'the latest artifact' to improve the phrasing.

Review the summary for a latest artifact from a specific release: