[GitHub] spark issue #17115: [Doc][Minor] Update R doc

[actuaryzhang <gi...@git.apache.org>]

Github user actuaryzhang commented on the issue:

    https://github.com/apache/spark/pull/17115
  
    @felixcheung I see lots of the SparkDataFrame methods use the following in examples:
    ```
     path <- "path/to/file.json"
     df <- read.json(path)
    ``` 
    I'm not sure where this json file resides. Do you think it's better to use a more concrete data example?


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