Improve docs for some internal classes related to https://github.com/apache/lucene/issues/15225 #15356
      
        
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Description
This change adds documentation to 4 @lucene.internal classes in the geo package.
This is my first contribution to Lucene. I have read the CONTRIBUTING.md. This change is part of #15225. This change started with Cursor LLM, but I have read everything. I have tried my best to validate that the information is accurate. And I altered the language to remove unnecessary adverbs or other awkward language.
The provided docs are verbose, but they seem useful. I would be happy to have feedback about whether the amount of content is appropriate or whether they should be more terse.