[SPARK-51200][BUILD] Add SparkR deprecation info to README.md and make-distribution.sh help
#49931
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What changes were proposed in this pull request?
This PR aims to add
SparkRdeprecation info additionally to the following for developers.README.mdmake-distribution.shhelp messageWhy are the changes needed?
SparkRis deprecated properly by the following.This PR adds a little more because
README.mdandmake-distribution.share the starting point for downstream Spark distribution developers.Does this PR introduce any user-facing change?
No behavior change. Only the documentation and help message of developer script.
How was this patch tested?
Manual review.
Was this patch authored or co-authored using generative AI tooling?
No