Add cache clearing instructions to FAQ / troubleshooting

[MatthysDev]

When encountering the Failed to serialize JavaScript object error, clearing Metro cache often resolves the issue. It would be helpful to add a recommended cache-clearing command to the FAQ section:

watchman watch-del-all 2>/dev/null; rm -rf node_modules/.cache
&& npx expo start --clear

This clears:

• Watchman file watcher cache
• node_modules/.cache (Babel, bundler caches)
• Expo's internal cache (--clear flag)

In our case, the serialization error was entirely caused by stale cache and this command fixed it immediately after hours of debugging 🙏

[jpudysz]

Hey man, issues are for issues with repro. I converted your issue to discussion and will mention it in the docs.

Thanks!

[jpudysz]

Pushed to the docs!