docs: an python object -> a python object

Author: star1327p

src/zarr/core/dtype/wrapper.py

@@ -191,7 +191,7 @@ def to_json(self, zarr_format: ZarrFormat) -> DTypeSpec_V2 | DTypeSpec_V3:
     @abstractmethod
     def _check_scalar(self, data: object) -> bool:
         """
-        Check that an python object is a valid scalar value for the wrapped data type.
+        Check that a python object is a valid scalar value for the wrapped data type.
 
         Parameters
         ----------