Resolve "Docs update usage of force option when running the restore raketask"

What does this MR do?

Updates usage of force=yes when performing gitlab-rake gitlab_backup:restore rake task.

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

Why was this MR needed?

Noted by customer that full usage of force=yes was unknown.

Screenshots (if relevant)

Does this MR meet the acceptance criteria?

• Changelog entry added, if necessary
• Documentation created/updated
• API support added
• Tests added for this feature/bug
• 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-qa manual pipeline job)

What are the relevant issue numbers?

Closes #42521 (closed)