Update nibabel/gifti/gifti.py

Co-Authored-By: Chris Markiewicz <[email protected]>

Author: htwangtw

nibabel/gifti/gifti.py

@@ -694,7 +694,7 @@ def agg_data(self, intent_code=None):
 
         Returns
         -------
-        all_data : tuple of ndarray or ndarray
+        tuple of ndarrays or ndarray
             If the input is a tuple, the returned tuple will match the order.
         """