Fix typo from 'orderWidth' to 'borderWidth'

orderWidth is not valid and it should be changed to borderWidth

Author: yash2974

versioned_docs/version-7.x/drawer-navigator.md

@@ -344,7 +344,7 @@ Example:
    drawerItemStyle: {
     backgroundColor: '#9dd3c8',
     borderColor: 'black',
-    orderWidth: 2,
+    borderWidth: 2,
     opacity: 0.6,
   },
 ```