Update README.md

data_processing/scripts/README.md

 The scripts in this folder are organized as follows:
 
-* ** download_files.py**: Contains functions for downloading and decompressing the files needed for analysis.
+* **download_files.py**: Contains functions for downloading and decompressing the files needed for analysis.
 *  **download_files.ipynb**: Jupyter notebook that applies the download functions to retrieve and decompress the files used for analysis.
 *  **preprocess_functions.py**: Contains functions for preprocessing and filtering the data from the files.
 *  **insert_tables.py**: Contains functions for inserting tables into the MySQL database.