Add note about material bottom tabs

Author: satya164

versioned_docs/version-7.x/upgrading-from-6.x.md

@@ -408,6 +408,10 @@ If you are using `@react-navigation/material-bottom-tabs` in your project, you c
 
 See [Material Bottom Tab Navigator](https://callstack.github.io/react-native-paper/docs/guides/bottom-navigation/) for usage.
 
+Alternatively, you can use the [`BottomNavigation.Bar`](https://callstack.github.io/react-native-paper/docs/components/BottomNavigation/BottomNavigationBar) component as a custom tab bar with `@react-navigation/bottom-tabs`.
+
+For any issues related to the Material Bottom Tab Navigator or `BottomNavigation.Bar`, please open them in the [react-native-paper repository](https://github.com/callstack/react-native-paper) instead of the React Navigation repository.
+
 #### The flipper devtools plugin is now removed
 
 Previously, we added a Flipper plugin for React Navigation to make debugging navigation easier. However, it has added significant maintenance overhead for us. The Flipper team hasn't been focused on React Native recently, so the overall experience of using Flipper with React Native has been poor.