Apply suggestion from @Copilot

Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>

Author: matthiasgoergens

Lib/test/test_deque.py

@@ -287,7 +287,7 @@ def test_slice_preserves_maxlen(self, dq, start, stop, step):
         self.assertEqual(result.maxlen, dq.maxlen)
 
     @hypothesis.given(composite_deques_optional_maxlen())
-    def test_exercise_auxilliary_operations(self, d):
+    def test_exercise_auxiliary_operations(self, d):
         self.assertIsInstance(str(d), str)
         self.assertIsInstance(repr(d), str)
         self.assertEqual(len(d), len(list(d)))