Updated 工作单元 (markdown)

工作单元.md

@@ -16,9 +16,9 @@ static IFreeSql fsql = new FreeSql.FreeSqlBuilder()
 ```csharp
 using (var uow = fsql.CreateUnitOfWork()) {
   var songRepo = fsql.GetRepository<Song>() 
-  { UnitOfWork = uow };
+  songRepo.UnitOfWork = uow;
   var userRepo = fsql.GetRepository<User>() 
-  { UnitOfWork = uow };
+  userRepo.UnitOfWork = uow;
 
   songRepo.Insert(new Song());
   userRepo.Update(...);