Address change requests for google_sign_in_web

packages/google_sign_in/google_sign_in_web/README.md

@@ -63,8 +63,11 @@ GoogleSignIn _googleSignIn = GoogleSignIn(
   ],
 );
 ```
+
 [Full list of available scopes](https://developers.google.com/identity/protocols/googlescopes).
 
+Note that the `serverClientId` parameter of the `GoogleSignIn` constructor is not supported on Web.
+
 You can now use the `GoogleSignIn` class to authenticate in your Dart code, e.g.
 
 ```dart

packages/google_sign_in/google_sign_in_web/lib/google_sign_in_web.dart

@@ -41,10 +41,10 @@ class GoogleSignInPlugin extends GoogleSignInPlatform {
   late Future<void> _isAuthInitialized;
   bool _isInitCalled = false;
 
-  // This method throws if initWithParams hasn't been called at some point in
-  // the past. It is used by the [initialized] getter to ensure that users can't
-  // await on a Future that will never resolve.
-  void _assertIsInitializeCalled() {
+  // This method throws if init or initWithParams hasn't been called at some
+  // point in the past. It is used by the [initialized] getter to ensure that
+  // users can't await on a Future that will never resolve.
+  void _assertIsInitCalled() {
     if (!_isInitCalled) {
       throw StateError(
         'GoogleSignInPlugin::init() or GoogleSignInPlugin::initWithParams() '
@@ -56,7 +56,7 @@ class GoogleSignInPlugin extends GoogleSignInPlatform {
   /// A future that resolves when both GAPI and Auth2 have been correctly initialized.
   @visibleForTesting
   Future<void> get initialized {
-    _assertIsInitializeCalled();
+    _assertIsInitCalled();
     return Future.wait(<Future<void>>[_isGapiInitialized, _isAuthInitialized]);
   }
 
@@ -89,7 +89,7 @@ class GoogleSignInPlugin extends GoogleSignInPlatform {
         appClientId != null,
         'ClientID not set. Either set it on a '
         '<meta name="google-signin-client_id" content="CLIENT_ID" /> tag,'
-        ' or pass clientId when calling initialize()');
+        ' or pass clientId when initializing GoogleSignIn');
 
     assert(params.serverClientId == null,
         'serverClientId is not supported on Web.');