[PR] [Typo] Fix typo in FileIndexFormat. [paimon]

[via GitHub]

wwj6591812 opened a new pull request, #5782:
URL: https://github.com/apache/paimon/pull/5782

   <!-- Please specify the module before the PR name: [core] ... or [flink] ... 
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   ### Purpose
   
   When I study the code of FileIndexFormat. I found that there are some 
details in the code comments and the top "image" of the class that do not 
match. 
   In order to reduce misunderstandings among other students, now I have fixed 
these typos.
   
   
![image](https://github.com/user-attachments/assets/0795958a-2e85-4bc2-bd0a-6e519ca4ee5f)
   
   
   <!-- Linking this pull request to the issue -->
   Linked issue: close #xxx
   
   <!-- What is the purpose of the change -->
   
   ### Tests
   
   <!-- List UT and IT cases to verify this change -->
   
   ### API and Format
   
   <!-- Does this change affect API or storage format -->
   
   ### Documentation
   
   <!-- Does this change introduce a new feature -->
   


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