Github user HyukjinKwon commented on the issue:

    https://github.com/apache/spark/pull/15487
  
    @hvanhovell @lins05 I just have a confirmation for the documentation format 
and will proceed to sweep it 
([SPARK-17963](https://issues.apache.org/jira/browse/SPARK-17963)). So, maybe 
you could do as below:
    
    ```scala
    @ExpressionDescription(
      usage =
        """
          _FUNC_() - Returns a random column with i.i.d. uniformly distributed 
values in [0, 1].
            seed is given randomly.
          _FUNC_(seed) - Returns a random column with i.i.d. uniformly 
distributed values in [0, 1].
            seed should be an integer/long/NULL literal.
        """,
      extended = "...")
    ```
    
    In the PR I am going to submit, I will exclude both functions, `first` and 
`last` and `ran` which would be handled in 
https://github.com/apache/spark/pull/15432


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