[improve][doc] Add options to stats and partitioned-stats

[AlvaroStream]

Motivation

I noticed there were some options not shown in the documentation but offered in the help of the tool.

Modifications

Add the options to stats and partitioned-stats in topics.

Verifying this change

• [ ] Make sure that the change passes the CI checks.

This change is a trivial rework / code cleanup without any test coverage.

Does this pull request potentially affect one of the following parts:

If the box was checked, please highlight the changes

• [ ] Dependencies (add or upgrade a dependency)
• [ ] The public API
• [ ] The schema
• [ ] The default values of configurations
• [ ] The binary protocol
• [ ] The REST endpoints
• [ ] The admin CLI options
• [ ] Anything that affects deployment

Documentation

• [ ] doc-required (Your PR needs to update docs and you will update later)

• [ ] doc-not-needed (Please explain why)

• [ X] doc (Your PR contains doc changes)

• [ ] doc-complete (Docs have been already added)

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