Quote browser-use key in JSON5 config example

Hyphens are invalid in unquoted JSON5 identifiers.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

docs/tools/browser.md

@@ -222,7 +222,7 @@ Set up a [Browser Use](https://cloud.browser-use.com) cloud browser profile with
     remoteCdpTimeoutMs: 3000,
     remoteCdpHandshakeTimeoutMs: 5000,
     profiles: {
-      browser-use: {
+      "browser-use": {
         // All Browser Use session params can be added as query params.
         // See: https://docs.browser-use.com/cloud/api-v2/browsers/create-browser-session
         cdpUrl: "wss://connect.browser-use.com?apiKey=<BROWSER_USE_API_KEY>&timeout=240&profileId=<PROFILE_ID>&proxyCountryCode=us",