chore: add words to cspell, fix dart formatting

- chore: add words to cspell
- fix: dart formatting
- fix: correct spelling in README.md

.github/cspell.json

@@ -23,5 +23,7 @@
     "Texto",
     "Andrea",
     "Bizzotto",
+    "thecodexhub",
+    "flutterfire"
   ]
 }

README.md

@@ -37,7 +37,7 @@ _\*Sudoku works on iOS, Android, and Web._
 
 ## Setup 🧩
 
-The project is designed to be integrated with 3 different Firebase projects (dependeing upon flavor).
+The project is designed to be integrated with 3 different Firebase projects (depending upon flavor).
 
 > The default app instance can be initialized here simply by passing no "name" as an argument in both Dart & manual initialization flows. If you have a google-services.json file in your android project or a GoogleService-Info.plist file in your iOS+ project, it will automatically create a default (named "[DEFAULT]") app instance on the native platform. However, you will still need to call this method before using any FlutterFire plugins.
 

lib/repository/authentication_repository.dart

@@ -70,7 +70,7 @@ class AuthenticationRepository {
     }
   }
 
-  /// Signs out the current user which will emit 
+  /// Signs out the current user which will emit
   /// [User.unauthenticated] from the [user] stream.
   Future<void> signOut() async {
     await _firebaseAuth.signOut();