Adds missing typehint in reward function (#1303)

# Description

Adds missing typehint in reward function

## Type of change

- Bug fix (non-breaking change which fixes an issue)

## Checklist

- [x] I have run the [`pre-commit` checks](https://pre-commit.com/) with
`./isaaclab.sh --format`
- [ ] 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
- [x] I have added my name to the `CONTRIBUTORS.md` or my name already
exists there

Author: lgulich

source/extensions/omni.isaac.lab/omni/isaac/lab/envs/mdp/rewards.py

@@ -159,7 +159,7 @@ def joint_acc_l2(env: ManagerBasedRLEnv, asset_cfg: SceneEntityCfg = SceneEntity
     return torch.sum(torch.square(asset.data.joint_acc[:, asset_cfg.joint_ids]), dim=1)
 
 
-def joint_deviation_l1(env, asset_cfg: SceneEntityCfg = SceneEntityCfg("robot")) -> torch.Tensor:
+def joint_deviation_l1(env: ManagerBasedRLEnv, asset_cfg: SceneEntityCfg = SceneEntityCfg("robot")) -> torch.Tensor:
     """Penalize joint positions that deviate from the default one."""
     # extract the used quantities (to enable type-hinting)
     asset: Articulation = env.scene[asset_cfg.name]