[SPARK-47993][PYTHON][FOLLOW-UP] Update migration guide about Python 3.8 dropped. #46545
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What changes were proposed in this pull request?
This PR is a followup of #46228 that updates migration guide about Python 3.8 being dropped.
Why are the changes needed?
To guide end users about the migration to Spark 4.0.
Does this PR introduce any user-facing change?
Yes, it fixes the documentation.
How was this patch tested?
CI in this PR.
Was this patch authored or co-authored using generative AI tooling?
No.