Update doc/data/messages/s/simplifiable-if-expression/good.py

Co-authored-by: Daniël van Noord <[email protected]>

Author: Pierre-Sassoulas

doc/data/messages/s/simplifiable-if-expression/good.py

@@ -2,4 +2,5 @@
 
 def is_flying_animal(an_object):
     is_flying = isinstance(an_object, Animal) and an_object.name in FLYING_THINGS
-    return is_flying, not is_flying
+    is_not_flying = not is_flying
+    return is_flying, is_not_flying