Remove orphan comment (#2774)
Remove orphan comment (#2774)

* Remove orphan comment

The comment used to be due to the line that is not there anymore, like:
```python
from gym.envs.mujoco.mujoco_env import MujocoEnv

# ^^^^^ so that user gets the correct error
# message if mujoco is not installed correctly
```

Now the comment is useless.

* Update __init__.py
Farama-Foundation/Gymnasium,Farama-Foundation/Gymnasium