griffe warning fixes

qim3d/io/_ome_zarr.py

@@ -220,6 +220,9 @@ def export_ome_zarr(
 
         qim3d.io.export_ome_zarr("Escargot.zarr", data, chunk_size=100, downsample_rate=2)
         ```
+
+    Returns:
+        None (None): This function writes the OME-Zarr data to the specified directory and does not return any value.
     """
 
     # Check if directory exists