[go_router] Update redirect documentation example code for clarity (flutter#6213)

The redirection documentation page gives an example where the top level redirect may be used to send non-signed-in users to the signin page. The example code seems to be doing so for signed in users, however.

This is a documentation-only change.

Author: elitree

packages/go_router/CHANGELOG.md

@@ -1,3 +1,7 @@
+## 14.0.1
+
+- Updates the redirection documentation for clarity
+
 ## 14.0.0
 
 - **BREAKING CHANGE**

packages/go_router/doc/redirection.md

@@ -10,7 +10,7 @@ either the GoRouter or GoRoute constructor:
 
 ```dart
 redirect: (BuildContext context, GoRouterState state) {
-  if (AuthState.of(context).isSignedIn) {
+  if (!AuthState.of(context).isSignedIn) {
     return '/signin';
   } else {
     return null;

packages/go_router/pubspec.yaml

@@ -1,7 +1,7 @@
 name: go_router
 description: A declarative router for Flutter based on Navigation 2 supporting
   deep linking, data-driven routes and more
-version: 14.0.0
+version: 14.0.1
 repository: https://github.com/flutter/packages/tree/main/packages/go_router
 issue_tracker: https://github.com/flutter/flutter/issues?q=is%3Aissue+is%3Aopen+label%3A%22p%3A+go_router%22