[PR] MINOR:Add a description document to batchlength [kafka]

[via GitHub]

gongxuanzhang opened a new pull request, #20140:
URL: https://github.com/apache/kafka/pull/20140

   
   Add a document for Batch Format to explain the meaning of batchLength.
   
   This is the preview image after change:
   
   
![image](https://github.com/user-attachments/assets/85023c48-64e6-4a33-898f-df84f6864e58)
   


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