chore: explain android captureScreenViews fallback (#9113)

contents/docs/integrate/send-events/_snippets/send-events-android.mdx

@@ -41,6 +41,16 @@ PostHog autocapture automatically tracks the following events for you:
 
 With [`captureScreenViews = true`](/docs/libraries/android#all-configuration-options), PostHog will try to record all screen changes automatically.
 
+The `screenTitle` will be the [`<activity>`](https://developer.android.com/guide/topics/manifest/activity-element)'s `android:label`, if not set it'll fallback to the [`<application>`](https://developer.android.com/guide/topics/manifest/application-element)'s `android:label` or the [`<activity>`](https://developer.android.com/guide/topics/manifest/activity-element)'s `android:name`.
+
+```xml
+<activity
+    android:name="com.example.app.ChildActivity"
+    android:label="@string/title_child_activity"
+    ...
+</activity>
+```
+
 If you want to manually send a new screen capture event, use the `screen` function.
 
 This function requires a `screenTitle`. You may also pass in an optional `properties` object.