pandas docs json_normalize example
- [x] closes #36184 
- [x] Inserted " pandas. " preceding the json_normalize() method in the example cells where it was missing.
Documentation Location : [https://pandas.pydata.org/pandas-docs/stable/reference/api/pandas.json_normalize.html](https://pandas.pydata.org/pandas-docs/stable/reference/api/pandas.json_normalize.html)