[SPARK-48759][SQL] Add migration doc for CREATE TABLE AS SELECT behavior change behavior change since Spark 3.4#47152

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asl3 wants to merge 2 commits intoapache:masterfrom asl3:allowNonEmptyLocationInCTAS

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Commits on Jun 30, 2024

add create table behavior change to SQL migration docs
asl3
committed

Commits on Jul 1, 2024

ask users to avoid CTAS with nonempty table location
asl3
committed