Fix typo in err msg

Co-authored-by: Mathias Hauser <mathause@users.noreply.github.com>

Author: cakedev0

src/array_api_extra/_delegation.py

@@ -948,7 +948,7 @@ def quantile(
 
     nan_policy : str, optional
         'propagate' (default) or 'omit'.
-        'omit' is support only when `weights` are provided.
+        'omit' is supported only when `weights` are provided.
 
     weights : array_like, optional
         An array of weights associated with the values in `a`. Each value in