style: fix markdown code fences in env_processor.mdx

Made-with: Cursor

docs/source/env_processor.mdx

@@ -88,7 +88,7 @@ policy_preprocessor = NormalizerProcessorStep(stats=dataset_stats)
 
 The same policy can work with different environment processors, and the same environment processor can work with different policies:
 
-```python
+````python
 # Use SmolVLA policy with LIBERO environment
 libero_preprocessor, libero_postprocessor = make_env_pre_post_processors(libero_cfg)
 smolvla_preprocessor, smolvla_postprocessor = make_pre_post_processors(smolvla_cfg)
@@ -139,7 +139,7 @@ class LiberoVelocityProcessorStep(ObservationProcessorStep):
         state = torch.cat([eef_pos, eef_axisangle, eef_vel,
                           gripper_pos, gripper_vel], dim=-1)  # 14D
         return state
-```
+````
 
 ### 4. **Cleaner Environment Code**
 
@@ -325,7 +325,7 @@ class MyEnvProcessorStep(ObservationProcessorStep):
 
 ### 2. Update the Factory
 
-```python
+````python
 # In src/lerobot/envs/factory.py
 
 def make_env_pre_post_processors(env_cfg: EnvConfig):
@@ -364,7 +364,7 @@ lerobot-eval \
     --policy.path=lerobot/my_policy \
     --env.type=myenv \  # Automatically uses MyEnvProcessorStep
     --eval.n_episodes=10
-```
+````
 
 ## Future: Environment Postprocessors