[SPARK-32685][SQL][FOLLOW-UP] Update migration guide about change default filed.delim to '\t' when user specifies serde#31051

AngersZhuuuu wants to merge 2 commits intoapache:masterapache/spark:masterfrom

AngersZhuuuu:SPARK-32685-FOLLOW-UPAngersZhuuuu/spark:SPARK-32685-FOLLOW-UPCopy head branch name to clipboard