add notes for complying user data policy in 4.10.1

Author: wenxi-zeng

src/connections/sources/catalog/libraries/mobile/android/index.md

@@ -26,6 +26,9 @@ The Segment SDK also collects the [Advertising ID](https://developer.android.com
 
 Segment also collects the [Android ID](http://developer.android.com/reference/android/provider/Settings.Secure.html#ANDROID_ID) as `context.device.id`. Some destinations rely on this field being the Android ID, so double check the destinations' vendor documentation if you choose to override the default value.
 
+> warning ""
+> **Note:** From `4.10.1`, Segment no longer collects the `Android ID` to comply with Google's [User Data Policy](https://support.google.com/googleplay/android-developer/answer/10144311). Instead, `context.device.id` by default is generated by [DRM API](https://source.android.com/devices/drm). If the destination' vendor requires `Android ID` as the identifier, you will have to override this field manually. See [Best practices for unique identifiers]( https://developer.android.com/training/articles/user-data-ids) for more infomation.
+
 ## API call queuing in Analytics-Android
 
 The Analytics-Android library queues API calls and uploads them in batches. This limits the number of network calls made, and helps save battery on the user's device.