Update navigation-state.md

Even though it isn’t actually incorrect—just illustrative rather than literal, It can definitely feel confusing at first glance because routes will only contain the screens that were in your persisted (partial) state

The example is bit bit misleading if you assume it’s a one-to-one transformation of the names you passed in

Author: ladp333

versioned_docs/version-6.x/navigation-state.md

@@ -101,7 +101,7 @@ const state = {
   routeNames: ['Home', 'Profile', 'Settings'],
   routes: [
     { key: 'home-1', name: 'Home' },
-    { key: 'settings-1', name: 'Settings' },
+    { key: 'profile-1', name: 'Profile' },
   ],
   index: 1,
   stale: false,