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[MINOR][PYTHON][DOCS] Refine the docstring of `VariantVal` #12615

Job	Run time
Run / Check changes	38s
Run / Base image build	1m 19s
Run / Protobuf breaking change detection and Python CodeGen check	0s
Run / Run TPC-DS queries with SF=1	0s
Run / Run Docker integration tests	0s
Run / Build modules: ${{ matrix.modules }} ${{ matrix.comment }}	0s
Run / Run Spark on Kubernetes Integration test	0s
Run / Run Spark UI tests	0s
Run / Build modules: pyspark-sql, pyspark-resource, pyspark-testing	1h 6m 34s
Run / Linters, licenses, and dependencies	27m 40s
Run / Build modules: pyspark-core, pyspark-errors, pyspark-streaming, pyspark-logger	20m 33s
Run / Documentation generation	0s
Run / Build modules: sparkr	0s
Run / Build modules: pyspark-mllib, pyspark-ml, pyspark-ml-connect	1h 15m 23s
Run / Build modules: pyspark-connect	55m 49s
	4h 7m 56s

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