Fixed output text in the ptq onnx example (openvinotoolkit#2272)

### Changes

Fixed output text in the ptq onnx example

### Reason for changes

Incorrect output text in the ptq onnx example

### Related tickets

N/A

### Tests

test_examples

examples/post_training_quantization/onnx/mobilenet_v2/main.py

@@ -140,11 +140,11 @@ def transform_fn(data_item):
 print("[4/7] Benchmark INT8 model:")
 int8_fps = run_benchmark(int8_model_path, shape=[1, 3, 224, 224], verbose=True)
 
-print("[5/7] Validate OpenVINO FP32 model:")
+print("[5/7] Validate ONNX FP32 model in OpenVINO:")
 fp32_top1 = validate(fp32_model_path, val_loader)
 print(f"Accuracy @ top1: {fp32_top1:.3f}")
 
-print("[6/7] Validate OpenVINO INT8 model:")
+print("[6/7] Validate ONNX INT8 model in OpenVINO:")
 int8_top1 = validate(int8_model_path, val_loader)
 print(f"Accuracy @ top1: {int8_top1:.3f}")