Added modification note (#3089)

### Changes

Added modification note

### Reason for changes

Legal requirements

### Related tickets

N/A

### Tests

N/A

Author: alexsu52

tests/openvino/native/quantization/test_gptq.py

@@ -22,6 +22,10 @@
 from nncf.quantization.algorithms.weight_compression.gptq import GPTQ
 from nncf.tensor.tensor import Tensor
 
+# Modification Notes:
+# This unit test is adapted from:
+# https://github.com/AutoGPTQ/AutoGPTQ/blob/main/auto_gptq/quantization/quantizer.py
+
 
 def quantize(x, scale, zero, minq, maxq):
     if maxq < 0: