[PR] MINOR: Fix the leak "unknown" `group.coordinator.rebalance.protocols` on document [kafka]

[via GitHub]

m1a2st opened a new pull request, #17834:
URL: https://github.com/apache/kafka/pull/17834

   Although "unknown" `group.coordinator.rebalance.protocols` type is a valid 
string in internal kafka system, but the common user should not config this 
"unknown" type, so we should remove it from the document.
   
   test in my local
   ![CleanShot 2024-11-16 at 17 39 
33](https://github.com/user-attachments/assets/ee271a10-8b14-43b6-b3fd-d103e735262a)
   
   
   *Summary of testing strategy (including rationale)
   for the feature or bug fix. Unit and/or integration
   tests are expected for any behaviour change and
   system tests should be considered for larger changes.*
   
   ### Committer Checklist (excluded from commit message)
   - [ ] Verify design and implementation 
   - [ ] Verify test coverage and CI build status
   - [ ] Verify documentation (including upgrade notes)
   


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