Fix link in drawer-based-navigation.md (react-navigation#529)

Author: Rizwanjamal

docs/drawer-based-navigation.md

@@ -6,7 +6,7 @@ sidebar_label: Drawer navigation
 
 Common pattern in navigation is to use drawer from left (sometimes right) site for navigating between screens.
 
-Before continuing, first install [`@react-navigation/drawer`](https://github.com/navigation-ex/packages/drawer) following the guide on [Drawer Navigator's page](drawer-navigator.html).
+Before continuing, first install [`@react-navigation/drawer`](https://github.com/react-navigation/navigation-ex/tree/master/packages/drawer) following the guide on [Drawer Navigator's page](drawer-navigator.html).
 
 ## Minimal example of drawer-based navigation