fix tests

tests/test_gym_envs.py

@@ -64,7 +64,7 @@
     for message in [
         "For Box action spaces, we recommend using a symmetric and normalized space (range=[-1, 1] or [0, 1]). See https://stable-baselines3.readthedocs.io/en/master/guide/rl_tips.html for more information.",
         "A Box observation space minimum value is -infinity. This is probably too low.",
-        "A Box observation space maximum value is -infinity. This is probably too high.",
+        "A Box observation space maximum value is infinity. This is probably too high.",
         "Human rendering should return `None`, got <class 'numpy.ndarray'>",
         "RGB-array rendering should return a numpy array in which the last axis has three dimensions, got 4",
     ]