[go_router] Fix(docs): Typo in Update navigation.md (#5545)

Fixed a typo in navigation.md:
```dart
context.go('/123, extra: 'abc');
```
to 
```dart
context.go('/123', extra: 'abc');
```

*List which issues are fixed by this PR. You must list at least one issue.*

*If you had to change anything in the [flutter/tests] repo, include a link to the migration guide as per the [breaking change policy].*

packages/go_router/CHANGELOG.md

@@ -1,3 +1,7 @@
+## 12.1.3
+
+* Fixes a typo in `navigation.md`.
+
 ## 12.1.2
 
 * Fixes an incorrect use of `extends` for Dart 3 compatibility.

packages/go_router/doc/navigation.md

@@ -88,7 +88,7 @@ onTap: () => context.pop(true)
 You can provide additional data along with navigation.
 
 ```dart
-context.go('/123, extra: 'abc');
+context.go('/123', extra: 'abc');
 ```
 
 and retrieve the data from GoRouterState

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: 12.1.2
+version: 12.1.3
 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