### What changes were proposed in this pull request?
Update both `DataFrame.approxQuantile` and `DataFrameStatFunctions.approxQuantile` to support overloaded definitions when multiple columns are supplied.
### Why are the changes needed?
The current type hints don't support the multi-column signature, a form that was added in Spark 2.2 (see [the approxQuantile docs](https://spark.apache.org/docs/latest/api/python/reference/api/pyspark.sql.DataFrame.approxQuantile.html).) This change was also introduced to pyspark-stubs (https://github.com/zero323/pyspark-stubs/pull/552). zero323 asked me to open a PR for the upstream change.
### Does this PR introduce _any_ user-facing change?
This change only affects type hints - it brings the `approxQuantile` type hints up to date with the actual code.
### How was this patch tested?
Ran `./dev/lint-python`.
Closes#33880 from carylee/master.
Authored-by: Cary Lee <cary@amperity.com>
Signed-off-by: zero323 <mszymkiewicz@gmail.com>
(cherry picked from commit 37f5ab07fa)
Signed-off-by: zero323 <mszymkiewicz@gmail.com>
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