docs: fix OpenRouter import example

[xiazl1993]

Summary

• Update the OpenRouter supported-models example to import ChatOpenRouter from �rowser_use.llm
• Keep the top-level �rowser_use import for Agent

Validation

• Documentation-only change
• Confirmed the PR diff only modifies docs/open-source/supported-models.mdx
• Checked that �rowser_use.llm exports ChatOpenRouter

Related: browser-use/browser-use#4755

---

Summary by cubic

Correct the OpenRouter example in supported-models docs: import Agent from browser_use and ChatOpenRouter from browser_use.llm. Aligns the docs with current exports to avoid import errors.

^{Written for commit 2418709. Summary will update on new commits.}

[cubic-dev-ai]

No issues found across 1 file

_{Re-trigger cubic}