docs(release-notes): add update note for Android custom sound users (#16

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docs/react-native/docs/release-notes.md

@@ -7,7 +7,7 @@ previous: /react-native/docs/license-keys
 
 ## 1.10.0
 - **[Android/iOS]**: Introduces the following APIs: `getDeliveredNotifications`, `getTriggerNotifications`, `isChannelBlocked`, `isChannelCreated`, `cancelAllNotifications(ids)`, `cancelDisplayedNotifications(ids)`,  `cancelTriggerNotifications(ids)`.
-- **[Android]**: Fixes an issue when setting a custom sound on a notification channel (Fixes [#341](https://github.com/notifee/react-native-notifee/issues/341))
+- **[Android]**: Fixes an issue when setting a custom sound on a notification channel (Fixes [#341](https://github.com/notifee/react-native-notifee/issues/341)) - **If you were using custom sounds on Android>7 prior to this, you will need to create a *new* notification channel or the reference to your custom sound on the channel will likely not survive app updates. We apologize for the inconvenience**
 
 ## 1.9.2
 - **[Android]**: Fixes an issue where an error is thrown when the intent was null in rare cases for foreground service events.