Format README code examples

Author: HermiaHuan

README.md

@@ -138,7 +138,7 @@ import torch
 from vllm.config.compilation import CompilationConfig
 
 
-if __name__ == '__main__':
+if __name__ == "__main__":
     prompts = [
         "Hello, my name is",
     ]

tests/README.md

@@ -303,6 +303,7 @@ Unit tests should be fast, isolated, and not require GPU or model weights. Use t
 import pytest
 import torch
 
+
 class TestMyOp:
     def test_basic(self, device):
         """The `device` fixture returns cuda:0 or npu:0 automatically."""
@@ -322,6 +323,7 @@ import torch
 
 pytestmark = pytest.mark.gpu
 
+
 def test_my_kernel(device):
     x = torch.randn(16, 256, device=device)
     result = my_kernel(x)