[GitHub] spark pull request #20551: [SPARK-23271][DOC] Document the empty dataframe w...

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[GitHub] spark pull request #20551: [SPARK-23271][DOC] Document the empty dataframe w...

GitHub user dilipbiswal opened a pull request: https://github.com/apache/spark/pull/20551 [SPARK-23271][DOC] Document the empty dataframe write semantics ## What changes were proposed in this pull request? Document the change in semantics while writing/saving empty dataframes in