docs: Update vllm inference doc

[Sherlock113]

What does this PR address?

Fixes #(issue)

Before submitting:

• Does the Pull Request follow Conventional Commits specification naming? Here are GitHub's
  guide on how to create a pull request.
• Does the code follow BentoML's code style, pre-commit run -a script has passed (instructions)?
• Did you read through contribution guidelines and follow development guidelines?
• Did your changes require updates to the documentation? Have you updated
  those accordingly? Here are documentation guidelines and tips on writting docs.
• Did you write tests to cover your changes?

[hyperlint-ai]

PR Change Summary

Updated the vLLM inference documentation to enhance clarity and include new features.

• Revised the list of supported LLMs to include gpt-oss, DeepSeek, Qwen, and Llama.
• Improved code examples for defining model and GPU configurations.
• Clarified the usage of the BentoML service decorator and runtime environment specifications.
• Updated instructions for calling OpenAI-compatible endpoints after deployment.

Modified Files

• docs/source/examples/vllm.rst

---

How can I customize these reviews?

Check out the Hyperlint AI Reviewer docs for more information on how to customize the review.

If you just want to ignore it on this PR, you can add the hyperlint-ignore label to the PR. Future changes won't trigger a Hyperlint review.

Note specifically for link checks, we only check the first 30 links in a file and we cache the results for several hours (for instance, if you just added a page, you might experience this). Our recommendation is to add hyperlint-ignore to the PR to ignore the link check for this PR.