[Misc] Add SPDX-FileCopyrightText (#19100)

Signed-off-by: simon-mo <simon.mo@hey.com>

tests/entrypoints/openai/correctness/test_lmeval.py

@@ -1,4 +1,5 @@
 # SPDX-License-Identifier: Apache-2.0
+# SPDX-FileCopyrightText: Copyright contributors to the vLLM project
 """
 This file test accuracy of the vLLM server via LMEval.
 It uses local-completions, which interacts with vLLM

tests/entrypoints/openai/correctness/test_mteb.py

@@ -1,4 +1,5 @@
 # SPDX-License-Identifier: Apache-2.0
+# SPDX-FileCopyrightText: Copyright contributors to the vLLM project
 import os
 
 import pytest

tests/entrypoints/openai/correctness/test_transcription_api_correctness.py

@@ -1,4 +1,5 @@
 # SPDX-License-Identifier: Apache-2.0
+# SPDX-FileCopyrightText: Copyright contributors to the vLLM project
 """
 Evaluate Transcription API correctness by computing Word Error Rate (WER)
 on a given ASR dataset. When provided, it will also compare the WER against