Update missing copyright information for run_onnx_squad.py (#1069)

Update copyright for a python file that was modified when added to our code 

examples/nlp/python_bert_squad/run_onnx_squad.py

+# Modifications Copyright (C) 2022, Advanced Micro Devices, Inc. All rights reserved
 # Copyright 2018 The Google AI Language Team Authors.
 #
 # Licensed under the Apache License, Version 2.0 (the "License");