hiroyuki-sato opened a new pull request, #46319:
URL: https://github.com/apache/arrow/pull/46319

   ### Rationale for this change
   
   There are no Extension Array/Type documentation in the [API Reference 
page](https://arrow.apache.org/docs/cpp/api.html).
   
   ### What changes are included in this PR?
   
   Add Extension Array / Type API documents.
   
   ### Are these changes tested?
   
   No. (Add document only)
   
   ### Are there any user-facing changes?
   
   No.


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