[GitHub] spark pull request #19328: [SPARK-22088][SQL][Documentation] Add usage and i...

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[GitHub] spark pull request #19328: [SPARK-22088][SQL][Documentation] Add usage and i...

GitHub user kevinyu98 opened a pull request: https://github.com/apache/spark/pull/19328 [SPARK-22088][SQL][Documentation] Add usage and improve documentation with arguments and examples for trim function ## What changes were proposed in this pull request? This PR proposes