what changed

• adds documentation for headers passed into localBrowser.connect()

---

Summary by cubic

Adds documentation for passing authentication headers to localBrowser.connect() (TypeScript and Python) and ConnectLocalBrowser (Go).

• Shows how to pass headers without putting credentials in the connection URL.
• Documents that headers are sent with HTTP discovery and the WebSocket connection, only forwarded to the same host and port, and never passed to the extension.
• Promotes the "Connecting over CDP" heading so the extension CDP URL anchor link resolves correctly.