[vLLM Snippet] Fix escaping

[mishig25]

Follow up to #693

There was trailing space in vlmm snippet which made the snippet unusable. When you try the snippet, vllm server would respond with error:

mishig@machine:~$ # Call the server using curl:
curl -X POST "http://localhost:8000/v1/chat/completions" \ 
        -H "Content-Type: application/json" \ 
        --data '{
                "model": "meta-llama/Llama-3.2-3B-Instruct",
                "messages": [
                        {"role": "user", "content": "Hello!"}
                ]
        }'

{"object":"error","message":"[{'type': 'missing', 'loc': ('body',), 'msg': 'Field required', 'input': None}]","type":"BadRequestError","param":null,"code":400}curl: (3) URL using bad/illegal format or missing URL
-H: command not found
--data: command not found
mishig@machine:~$ 

Explanation: trailing space was breaking the escaping

[julien-c]

thx for fixing