Fix a method name in FirebaseInAppMessaging (#13789)

Author: MojtabaHs

FirebaseInAppMessaging/Sources/Flows/FIRIAMFetchFlow.m

@@ -95,9 +95,9 @@ - (void)sendFetchIsDoneNotification {
                                                       object:self];
 }
 
-- (void)handleSuccessullyFetchedMessages:(NSArray<FIRIAMMessageDefinition *> *)messagesInResponse
-                       withFetchWaitTime:(NSNumber *_Nullable)fetchWaitTime
-                      requestImpressions:(NSArray<FIRIAMImpressionRecord *> *)requestImpressions {
+- (void)handleSuccessfullyFetchedMessages:(NSArray<FIRIAMMessageDefinition *> *)messagesInResponse
+                        withFetchWaitTime:(NSNumber *_Nullable)fetchWaitTime
+                       requestImpressions:(NSArray<FIRIAMImpressionRecord *> *)requestImpressions {
   FIRLogDebug(kFIRLoggerInAppMessaging, @"I-IAM700004", @"%lu messages were fetched successfully.",
               (unsigned long)messagesInResponse.count);
 
@@ -233,9 +233,9 @@ - (void)checkAndFetchForInitialAppLaunch:(BOOL)forInitialAppLaunch {
                              [self.activityLogger addLogRecord:record];
 
                              // Now handle the fetched messages.
-                             [self handleSuccessullyFetchedMessages:messages
-                                                  withFetchWaitTime:nextFetchWaitTime
-                                                 requestImpressions:impressions];
+                             [self handleSuccessfullyFetchedMessages:messages
+                                                   withFetchWaitTime:nextFetchWaitTime
+                                                  requestImpressions:impressions];
 
                              if (forInitialAppLaunch) {
                                [self checkForAppLaunchMessage];