Don't use "-f" with "rm" in Gitlab-Basics Docs

What does this MR do? / Why was this MR needed?

Closes #20071 (closed).

Are there points in the code the reviewer needs to double check?

No.

Screenshots (if relevant)

Not relevant.

Does this MR meet the acceptance criteria?

• Changelog entry added, if necessary
• Documentation created/updated
• API support added (not relevant)
• Tests added for this feature/bug (not relevant)
• Review
  • Has been reviewed by UX
  • Has been reviewed by Frontend
  • Has been reviewed by Backend
  • Has been reviewed by Database
• Conform by the merge request performance guides
• Conform by the style guides
• Squashed related commits together
• Internationalization required/considered
• End-to-end tests pass (package-and-qa manual pipeline job)

What are the relevant issue numbers?

#20071 (closed)