Fix numbers.Real.__rdivmod__ doc string (#31991)

Lib/numbers.py

@@ -228,7 +228,7 @@ def __divmod__(self, other):
         return (self // other, self % other)
 
     def __rdivmod__(self, other):
-        """divmod(other, self): The pair (self // other, self % other).
+        """divmod(other, self): The pair (other // self, other % self).
 
         Sometimes this can be computed faster than the pair of
         operations.