Github user vanzin commented on the pull request:

    https://github.com/apache/spark/pull/8753#issuecomment-140205806
  
    It's not just typos; it encapsulates several things about the config option 
in a single place:
    - name
    - type
    - default value
    
    Right now, every place where a config option is used needs to duplicate 
those three things for the code to be consistent.
    
    If you add documentation to those 3, as `SQLConf` does, you could write a 
simple tool to automatically generate documentation for those options, removing 
yet another place where duplication might occur.


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