Github user gatorsmile commented on the issue:

    https://github.com/apache/spark/pull/15513
  
    We should also add the default value in the argument description. Below is 
an example.
    ```
        Arguments:
          col - a numeric expression.
          percentage - a numeric literal or an array literal of numeric type 
that defines the
            percentile between 0.0 and 1.0. For example, 0.5 means 
50-percentile.
          accuracy - a numeric literal that defines approximation accuracy.
    ```
    -> 
    ```
        Arguments:
          col - Data type: numeric.
          percentage - the percentile between 0.0 and 1.0. For example, 0.5 
means 50-percentile. Data type:  numeric or an array expression of numeric 
type. 
          accuracy - approximation accuracy. Data type: numeric. Default: 10000.
    ```


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