`ch6/synonym detection.ipynb` fails on reading non-existent `product_description.json`

[alexott]

---------------------------------------------------------------------------
FileNotFoundError                         Traceback (most recent call last)
Cell In[2], line 1
----> 1 product_description = pd.read_json("../data/temp/product_description.json")
      2 signals = pd.read_json("../data/temp/signal_sample.json")
      3 signals["query"] = signals["query_s"].apply(lambda x: re.sub("s$","", x.lower())) #conduct minimum stemming

File /opt/conda/lib/python3.10/site-packages/pandas/util/_decorators.py:211, in deprecate_kwarg.<locals>._deprecate_kwarg.<locals>.wrapper(*args, **kwargs)
    209     else:
    210         kwargs[new_arg_name] = new_arg_value
--> 211 return func(*args, **kwargs)

[alexott]

fixed by #93