[SPARK-30430][PYTHON][DOCS] Add a note that UserDefinedFunction's constructor is private #27101
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What changes were proposed in this pull request?
This PR adds a note that UserDefinedFunction's constructor is private.
Why are the changes needed?
To match with Scala side. Scala side does not have it at all.
Does this PR introduce any user-facing change?
Doc only changes but it declares UserDefinedFunction's constructor is private explicitly.
How was this patch tested?
Jenkins