Updated comments in GIDSignInTest.m

Author: AkshatG6

GoogleSignIn/Tests/Unit/GIDSignInTest.m

@@ -928,7 +928,6 @@ - (void)testAddScopes_WithPreviouslyRequestedClaims {
   id profile = OCMStrictClassMock([GIDProfileData class]);
   OCMStub([profile email]).andReturn(kUserEmail);
 
-  // Mock for the method `addScopes`.
   GIDConfiguration *configuration = [[GIDConfiguration alloc] initWithClientID:kClientId
                                                                 serverClientID:nil
                                                                   hostedDomain:nil