Add faq section for swift and rn 2.0

Author: Niall Brennan

src/connections/sources/catalog/libraries/mobile/react-native/index.md

@@ -500,5 +500,10 @@ Segment supports these destinations for Analytics React Native 2.0 in device-mod
 - [Facebook App Events](https://www.npmjs.com/package/@segment/analytics-react-native-plugin-facebook-app-events){:target="_blank"}
 - [Firebase](https://www.npmjs.com/package/@segment/analytics-react-native-plugin-firebase){:target="_blank"}
 
+## FAQs
+### Can I use the catalog of device-mode destinations from Segments 1.X.X React-Native release?
+No, only the plugins listed above are supported in device-mode for Analytics React Native 2.0.
+### Will I still see device-mode integrations listed as `false` in the integrations object?
+When you successfully package a plugin in device-mode, you will no longer see the integration listed as `false` in the integrations object for a Segment event. This logic is now packaged in the event metadata, and is not surfaced in the Segment debugger.
 ## Changelog
 [View the Analytics React Native 2.0 changelog on GitHub](https://github.com/segmentio/analytics-react-native/releases){:target="_blank"}.

src/connections/sources/catalog/libraries/mobile/swift-ios/index.md

@@ -407,6 +407,11 @@ Segment supports these destinations for Analytics Swift, with more to come:
 * [Firebase](https://github.com/segment-integrations/analytics-swift-firebase)
 * [Mixpanel](https://github.com/segment-integrations/analytics-swift-mixpanel)
 
+## FAQs
+### Can I use the catalog of device-mode destinations from Analytics-iOS?
+No, only the plugins listed above are supported in device-mode for Analytics-Swift.
+### Will I still see device-mode integrations listed as `false` in the integrations object?
+When you successfully package a plugin in device-mode, you will no longer see the integration listed as `false` in the integrations object for a Segment event. This logic is now packaged in the event metadata, and is not surfaced in the Segment debugger.
 
 ## Changelog
 [View the Analytics-Swift changelog on GitHub](https://github.com/segmentio/analytics-swift/releases).