[DOC] Incorrect cudf jar name compared to the one available in downloads

[vamseeyarla]

Report incorrect documentation

Location of incorrect documentation
https://nvidia.github.io/spark-rapids/docs/get-started/getting-started.html#download-the-rapids-jars

Describe the problems or issues found in the documentation
It is mentioned that the sample version of jar for CUDA-10.1 is cudf-0.15-SNAPSHOT-cuda10-1.jar but the one available in the download section is cudf-0.14-SNAPSHOT-cuda10-1.jar.

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Suggested fix for documentation
Correct the proper name accordingly.

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[sameerz]

Closed by PR #637