docstring departures

Co-authored-by: coderabbitai[bot] <136622811+coderabbitai[bot]@users.noreply.github.com>

Author: tjorim

pyrail/models.py

@@ -36,6 +36,7 @@ class StationsApiResponse(ApiResponse):
 
 @dataclass
 class Departures(DataClassORJSONMixin):
+    """Represents departures data for a railway station."""
     number: int  # Number of departures
     departure: List[dict] = field(default_factory=list)  # List of departure details