Fixes typo in the Environment ID of the unitree robots in the `environments.rst` file (#986)

# Description

The links to the environment IDs in `docs/environments.rst` for the
Unitree Go1, A1, and Go2 (both rough and flat) were incorrect. I have
fixed them by providing the correct links.

## Type of change

- This change requires a documentation update

## Checklist

- [ ] I have run the [`pre-commit` checks](https://pre-commit.com/) with
`./isaaclab.sh --format`
- [x] I have made corresponding changes to the documentation
- [x] My changes generate no new warnings
- [ ] I have added tests that prove my fix is effective or that my
feature works
- [ ] I have updated the changelog and the corresponding version in the
extension's `config/extension.toml` file
- [ ] I have added my name to the `CONTRIBUTORS.md` or my name already
exists there

docs/source/features/environments.rst

@@ -165,14 +165,14 @@ Environments based on legged locomotion tasks.
 .. |velocity-flat-anymal-d-link| replace:: `Isaac-Velocity-Flat-Anymal-D-v0 <https://github.com/isaac-sim/IsaacLab/blob/main/source/extensions/omni.isaac.lab_tasks/omni/isaac/lab_tasks/manager_based/locomotion/velocity/config/anymal_d/flat_env_cfg.py>`__
 .. |velocity-rough-anymal-d-link| replace:: `Isaac-Velocity-Rough-Anymal-D-v0 <https://github.com/isaac-sim/IsaacLab/blob/main/source/extensions/omni.isaac.lab_tasks/omni/isaac/lab_tasks/manager_based/locomotion/velocity/config/anymal_d/rough_env_cfg.py>`__
 
-.. |velocity-flat-unitree-a1-link| replace:: `Isaac-Velocity-Flat-Unitree-A1-v0 <https://github.com/isaac-sim/IsaacLab/blob/main/source/extensions/omni.isaac.lab_tasks/omni/isaac/lab_tasks/manager_based/locomotion/velocity/config/unitree_a1/flat_env_cfg.py>`__
-.. |velocity-rough-unitree-a1-link| replace:: `Isaac-Velocity-Rough-Unitree-A1-v0 <https://github.com/isaac-sim/IsaacLab/blob/main/source/extensions/omni.isaac.lab_tasks/omni/isaac/lab_tasks/manager_based/locomotion/velocity/config/unitree_a1/rough_env_cfg.py>`__
+.. |velocity-flat-unitree-a1-link| replace:: `Isaac-Velocity-Flat-Unitree-A1-v0 <https://github.com/isaac-sim/IsaacLab/blob/main/source/extensions/omni.isaac.lab_tasks/omni/isaac/lab_tasks/manager_based/locomotion/velocity/config/a1/flat_env_cfg.py>`__
+.. |velocity-rough-unitree-a1-link| replace:: `Isaac-Velocity-Rough-Unitree-A1-v0 <https://github.com/isaac-sim/IsaacLab/blob/main/source/extensions/omni.isaac.lab_tasks/omni/isaac/lab_tasks/manager_based/locomotion/velocity/config/a1/rough_env_cfg.py>`__
 
-.. |velocity-flat-unitree-go1-link| replace:: `Isaac-Velocity-Flat-Unitree-Go1-v0 <https://github.com/isaac-sim/IsaacLab/blob/main/source/extensions/omni.isaac.lab_tasks/omni/isaac/lab_tasks/manager_based/locomotion/velocity/config/unitree_go1/flat_env_cfg.py>`__
-.. |velocity-rough-unitree-go1-link| replace:: `Isaac-Velocity-Rough-Unitree-Go1-v0 <https://github.com/isaac-sim/IsaacLab/blob/main/source/extensions/omni.isaac.lab_tasks/omni/isaac/lab_tasks/manager_based/locomotion/velocity/config/unitree_go1/rough_env_cfg.py>`__
+.. |velocity-flat-unitree-go1-link| replace:: `Isaac-Velocity-Flat-Unitree-Go1-v0 <https://github.com/isaac-sim/IsaacLab/blob/main/source/extensions/omni.isaac.lab_tasks/omni/isaac/lab_tasks/manager_based/locomotion/velocity/config/go1/flat_env_cfg.py>`__
+.. |velocity-rough-unitree-go1-link| replace:: `Isaac-Velocity-Rough-Unitree-Go1-v0 <https://github.com/isaac-sim/IsaacLab/blob/main/source/extensions/omni.isaac.lab_tasks/omni/isaac/lab_tasks/manager_based/locomotion/velocity/config/go1/rough_env_cfg.py>`__
 
-.. |velocity-flat-unitree-go2-link| replace:: `Isaac-Velocity-Flat-Unitree-Go2-v0 <https://github.com/isaac-sim/IsaacLab/blob/main/source/extensions/omni.isaac.lab_tasks/omni/isaac/lab_tasks/manager_based/locomotion/velocity/config/unitree_go2/flat_env_cfg.py>`__
-.. |velocity-rough-unitree-go2-link| replace:: `Isaac-Velocity-Rough-Unitree-Go2-v0 <https://github.com/isaac-sim/IsaacLab/blob/main/source/extensions/omni.isaac.lab_tasks/omni/isaac/lab_tasks/manager_based/locomotion/velocity/config/unitree_go2/rough_env_cfg.py>`__
+.. |velocity-flat-unitree-go2-link| replace:: `Isaac-Velocity-Flat-Unitree-Go2-v0 <https://github.com/isaac-sim/IsaacLab/blob/main/source/extensions/omni.isaac.lab_tasks/omni/isaac/lab_tasks/manager_based/locomotion/velocity/config/go2/flat_env_cfg.py>`__
+.. |velocity-rough-unitree-go2-link| replace:: `Isaac-Velocity-Rough-Unitree-Go2-v0 <https://github.com/isaac-sim/IsaacLab/blob/main/source/extensions/omni.isaac.lab_tasks/omni/isaac/lab_tasks/manager_based/locomotion/velocity/config/go2/rough_env_cfg.py>`__
 
 .. |velocity-flat-spot-link| replace:: `Isaac-Velocity-Flat-Spot-v0 <https://github.com/isaac-sim/IsaacLab/blob/main/source/extensions/omni.isaac.lab_tasks/omni/isaac/lab_tasks/manager_based/locomotion/velocity/config/spot/flat_env_cfg.py>`__