Inappropriated/copied function name

The `check_passwords_match` name is leftover from another example.  A better name would be something like `validate_query_params` or similar.

https://github.com/mlops-club/python-on-aws-course/blob/44f594440a8e4b43b38a22ed1abf04869a5fc78d/section-2--rest-apis/3--error-handling-and-data-validation/desired-state/src/files_api/schemas.py#L48