fix: update python api user docs (#784)

Author: ryantzr1

docs/source/using-the-python-api.mdx

@@ -7,13 +7,11 @@ and a [`~pipeline.Pipeline`].
 
 After that, simply run the pipeline and save the results.
 
-
 ```python
 import lighteval
 from lighteval.logging.evaluation_tracker import EvaluationTracker
 from lighteval.models.vllm.vllm_model import VLLMModelConfig
 from lighteval.pipeline import ParallelismManager, Pipeline, PipelineParameters
-from lighteval.utils.utils import EnvConfig
 from lighteval.utils.imports import is_accelerate_available
 
 if is_accelerate_available():
@@ -33,10 +31,8 @@ def main():
 
     pipeline_params = PipelineParameters(
         launcher_type=ParallelismManager.ACCELERATE,
-        env_config=EnvConfig(cache_dir="tmp/"),
         custom_task_directory=None, # if using a custom task
         # Remove the 2 parameters below once your configuration is tested
-        override_batch_size=1,
         max_samples=10
     )