Typo in 'files' module.

[mrschneid3r]

python-genai/google/genai/files.py

Line 591 in 420b5a7

config: Optional parameters to set `diplay_name`, `mime_type`, and `name`.

I think the parameter should be called display_name. I got a little confused by the doc and had to go look at the code to see if inside the function was the same, it's not, the function is correct.