#6751: docs(browser): update JSON configuration format in documentation

- fix docs format: change unquoted object keys to quoted strings in browser config json <!-- greptile_comment --> <h2>Greptile Overview</h2> <h3>Greptile Summary</h3> Updates the browser configuration examples in `docs/tools/browser.md` to use valid JSON-style quoted keys (e.g., `"browser"`, `"profiles"`, `"cdpPort"`) rather than unquoted JSON5 keys, improving copy/paste compatibility for users editing `~/.openclaw/openclaw.json`. <h3>Confidence Score: 4/5</h3> - Safe to merge; documentation-only change with a small consistency issue in remaining examples. - Reviewed the sole diff and surrounding context in `docs/tools/browser.md`. The change achieves its stated goal for the main config block, but other json5 examples in the same doc still use unquoted keys, which is inconsistent and may confuse readers; otherwise no functional or security impact. - docs/tools/browser.md (ensure all config examples follow the same quoted-key convention) <!-- greptile_other_comments_section --> _{(2/5) Greptile learns from your feedback when you react with thumbs up/down!} <!-- /greptile_comment -->