[SPARK-50433][DOCS][TEST] Fix confguring log4j2 guide docs for Spark on YARN and UT #48981
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What changes were proposed in this pull request?
As title.
Why are the changes needed?
SPARK-37814 (3.3.0) migrated logging system from log4j1 to log4j2, we should updated the docs as well.
Does this PR introduce any user-facing change?
Yes, docs are updated.
How was this patch tested?
Review.
Was this patch authored or co-authored using generative AI tooling?
No.