fix datanorm error msg (#30294)

paddle/fluid/operators/data_norm_op.cc

@@ -390,7 +390,7 @@ class DataNormKernel<platform::CPUDeviceContext, T>
       }
       default:
         PADDLE_THROW(platform::errors::InvalidArgument(
-            "Unknown storage order: %d", data_layout));
+            "Unknown storage order: %d, please use NCHW or NHWC", data_layout));
     }
   }
 };
@@ -701,7 +701,8 @@ class DataNormGradKernel<platform::CPUDeviceContext, T>
       }
       default:
         PADDLE_THROW(platform::errors::InvalidArgument(
-            "Unknown storage order: %s", data_layout_str));
+            "Unknown storage order: %s, please use NCHW or NHWC",
+            data_layout_str));
     }
   }
 };