correct linting issues on other files in same sample folder

Author: glasnt

retail/interactive-tutorials/src/main/java/product/DeleteProduct.java

@@ -17,9 +17,10 @@
 /*
  * Delete product from a catalog using Retail API
  */
-// [START retail_delete_product]
+
 package product;
 
+// [START retail_delete_product]
 import static setup.SetupCleanup.createProduct;
 
 import com.google.cloud.retail.v2.DeleteProductRequest;

retail/interactive-tutorials/src/main/java/product/GetProduct.java

@@ -19,6 +19,7 @@
  */
 
 package product;
+
 // [START retail_get_product]
 import static setup.SetupCleanup.createProduct;
 import static setup.SetupCleanup.deleteProduct;