Github user lw-lin commented on the issue:

    https://github.com/apache/spark/pull/15715
  
    Fix the leading spaces is needed, because without the fixing the code 
snippet would contain leading spaces as well(see the pic below), which is quite 
inconsistent with the other programming guides.
    
    
![snip20161101_5](https://cloud.githubusercontent.com/assets/15843379/19894596/8cc3547c-a088-11e6-986a-ad9c80f9bdba.png)


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