[Misc] Clean up test docstrings and names (#17521)

Signed-off-by: DarkLight1337 <tlleungac@connect.ust.hk>

tests/models/multimodal/generation/test_pixtral.py

@@ -1,8 +1,4 @@
 # SPDX-License-Identifier: Apache-2.0
-"""Compare the outputs of HF and vLLM for Mistral models using greedy sampling.
-
-Run `pytest tests/models/test_mistral.py`.
-"""
 import json
 from dataclasses import asdict
 from typing import TYPE_CHECKING, Any, Optional

tests/models/multimodal/generation/test_whisper.py

@@ -119,10 +119,10 @@ def run_test(
         assert output.outputs[0].text == expected
 
 
-@create_new_process_for_each_test("spawn")
 @pytest.mark.core_model
 @pytest.mark.parametrize(
     "model", ["openai/whisper-small", "openai/whisper-large-v3-turbo"])
+@create_new_process_for_each_test()
 def test_models(vllm_runner, model) -> None:
     run_test(
         vllm_runner,
@@ -131,11 +131,11 @@ def test_models(vllm_runner, model) -> None:
     )
 
 
-@create_new_process_for_each_test("spawn")
 @multi_gpu_test(num_gpus=2)
 @pytest.mark.core_model
 @pytest.mark.parametrize("model", ["openai/whisper-large-v3-turbo"])
 @pytest.mark.parametrize("distributed_executor_backend", ["ray", "mp"])
+@create_new_process_for_each_test()
 def test_models_distributed(
     vllm_runner,
     model,