whitespace fix (make linter happy)

Author: yyyyx4

src/sage/schemes/elliptic_curves/ell_generic.py

@@ -182,7 +182,7 @@ def assume_base_ring_is_field(self, flag=True):
 
 
         .. WARNING::
-        
+
             The flag affects all points created while the flag is set. Note
             that elliptic curves are unique parents, hence setting this flag
             may break seemingly unrelated parts of Sage.