[SPARK-40675][DOCS] Supplement undocumented spark configurations in `configuration.md`#38131

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Commits on Oct 7, 2022

[SPARK-40675][DOCS] Add missing spark configuration to configuration.md
dcoliversun
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remove internal configuration from doc
dcoliversun
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remove spark.plugins and spark.executor.allowSparkContext from doc
dcoliversun
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