[SPARK-21625][DOC] Add incompatible Hive UDF describe to DOC
[SPARK-21625][DOC] Add incompatible Hive UDF describe to DOC

## What changes were proposed in this pull request?

Add incompatible Hive UDF describe to DOC.

## How was this patch tested?

N/A

Author: Yuming Wang <wgyumg@gmail.com>

Closes #18833 from wangyum/SPARK-21625.

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