[PR] [WIP][SPARK-47227][FOLLOW][DOCS] Building Extensions [spark]

["grundprinzip (via GitHub)" <gi...@apache.org>]

grundprinzip opened a new pull request, #45340:
URL: https://github.com/apache/spark/pull/45340

   ### What changes were proposed in this pull request?
   This PR adds a number of improvements to the documentation about how to use the extension mechanisms for Spark Connect.
   
   ### Why are the changes needed?
   Documentation
   
   ### Does this PR introduce _any_ user-facing change?
   Documentation
   
   ### How was this patch tested?
   N/A
   
   
   ### Was this patch authored or co-authored using generative AI tooling?
   No


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