Update cf/mixin/fielddomain.py

Co-authored-by: Sadie L. Bartholomew <[email protected]>

Author: davidhassell

cf/mixin/fielddomain.py

@@ -2354,7 +2354,7 @@ def is_discrete_axis(self, *identity, **filter_kwargs):
         correspond to a continuous physical quantity, but only the
         following types of discrete axis are identified here:
 
-        * The feature instance axis of a discreate sampling geometry
+        * The feature instance axis of a discrete sampling geometry
           (DSG) domain.
 
         * An axis spanned by the domain topology construct of an