add summary

FreeSql.DbContext/Repository/Repository/IBaseRepository.cs

@@ -10,6 +10,11 @@ namespace FreeSql
     {
         Type EntityType { get; }
         IUnitOfWork UnitOfWork { get; set; }
+
+        /// <summary>
+        /// 注意：IFreeSql 属于顶级对象，事务无法自动传递。<para></para>
+        /// 手工传递事务：ISelect/IInsert/IDelete/IUpdate 可以使用 WithTransaction(uow.GetOrBeginTransaction())
+        /// </summary>
         IFreeSql Orm { get; }
 
         /// <summary>