style: revert quadruple backticks to triple (prettier compat)

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)
@@ -96,7 +96,7 @@ smolvla_preprocessor, smolvla_postprocessor = make_pre_post_processors(smolvla_c
 # Or use ACT policy with the same LIBERO environment
 libero_preprocessor, libero_postprocessor = make_env_pre_post_processors(libero_cfg)
 act_preprocessor, act_postprocessor = make_pre_post_processors(act_cfg)
-````
+```
 
 ### 3. **Easier Experimentation**
 
@@ -126,7 +126,7 @@ 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**
 
@@ -312,7 +312,7 @@ class MyEnvProcessorStep(ObservationProcessorStep):
 
 ### 2. Update the Factory
 
-````python
+```python
 # In src/lerobot/envs/configs.py
 @EnvConfig.register_subclass("myenv")
 @dataclass
@@ -326,7 +326,7 @@ class MyEnvConfig(EnvConfig):
             PolicyProcessorPipeline(steps=[MyEnvProcessorStep()]),
             PolicyProcessorPipeline(steps=[]),
         )
-````
+```
 
 ### 3. Use in Evaluation
 
@@ -337,7 +337,7 @@ lerobot-eval \
     --policy.path=lerobot/my_policy \
     --env.type=myenv \  # Automatically uses MyEnvProcessorStep
     --eval.n_episodes=10
-````
+```
 
 ## Future: Environment Postprocessors