"""
Gets and prints the spreadsheet's header columns
| param file_loc: | The file location of the spreadsheet |
|---|---|
| type file_loc: | str |
| param print_cols: | A flag used to print the columns to the console (default is False) |
| type print_cols: | bool |
| returns: | a list of strings representing the header columns |
| rtype: | list |
"""