[R][Doc] correct paths for the read_parquet examples in cloud storage vignette

[asfimport]

The S3 file paths don't run:

> library(arrow) 
> read_parquet(file = "s3://voltrondata-labs-datasets/nyc-taxi/year=2019/month=6/data.parquet") 
Error in url(file, open = "rb") : URL scheme unsupported by this method

It looks like the file names are part-0.parquetnotdata.parquet.

This runs:

read_parquet(file = "s3://voltrondata-labs-datasets/nyc-taxi/year=2019/month=6/part-0.parquet")

 

Reporter: Stephanie Hazlitt / @stephhazlitt

_{Note: This issue was originally created as ARROW-18116. Please see the migration documentation for further details.}

[asfimport]

Sam Albers / @boshek:
This was fixed with https://issues.apache.org/jira/browse/ARROW-17448 so it can probably be closed as it is correct on the main docs now: https://arrow.apache.org/docs/r/articles/fs.html