Fix typo of the FirebaseCore source files (#13333)

FirebaseCore/Extension/FIRLogger.h

@@ -133,7 +133,7 @@ NS_SWIFT_NAME(FirebaseLogger)
 /// - Parameters:
 ///   - level: The log level to use (defined by `FirebaseLoggerLevel` enum values).
 ///   - service: The service name of type `FirebaseLoggerService`.
-///   - code: The mesage code. Starting with "I-" which means iOS, followed by a capitalized
+///   - code: The message code. Starting with "I-" which means iOS, followed by a capitalized
 ///   three-character service identifier and a six digit integer message ID that is unique within
 ///   the service. An example of the message code is @"I-COR000001".
 ///   - message: Formatted string to be used as the log's message.

FirebaseCore/Sources/FIRApp.m

@@ -625,7 +625,7 @@ static FIRApp *sDefaultApp;
  *
  * @param appID Contents of GOOGLE_APP_ID from the plist file.
  * @param version Indicates what version of the app id format this string should be.
- * @return YES if provided string fufills the expected format, NO otherwise.
+ * @return YES if provided string fulfills the expected format, NO otherwise.
  */
 + (BOOL)validateAppIDFormat:(NSString *)appID withVersion:(NSString *)version {
   if (!appID.length || !version.length) {
@@ -707,8 +707,8 @@ static FIRApp *sDefaultApp;
  *
  * @param appID Contents of GOOGLE_APP_ID from the plist file.
  * @param version Indicates what version of the app id format this string should be.
- * @return YES if provided string fufills the expected hashed bundle ID and the version is known, NO
- *         otherwise.
+ * @return YES if provided string fulfills the expected hashed bundle ID and the version is known,
+ *         NO otherwise.
  */
 + (BOOL)validateBundleIDHashWithinAppID:(NSString *)appID forVersion:(NSString *)version {
   // Extract the hashed bundle ID from the given app ID.

FirebaseCore/Sources/FIRComponentContainer.m

@@ -148,7 +148,7 @@ static NSMutableSet<Class> *sFIRComponentRegistrants;
 ///   - Validate that the instance returned conforms to the protocol it claims to,
 ///   - Cache the instance if the block requests it
 ///
-/// Note that this method assumes the caller already has @sychronized on self.
+/// Note that this method assumes the caller already has @synchronized on self.
 - (nullable id)instantiateInstanceForProtocol:(Protocol *)protocol
                                     withBlock:(FIRComponentCreationBlock)creationBlock {
   if (!creationBlock) {

FirebaseCore/Sources/FIROptions.m

@@ -441,8 +441,8 @@ static dispatch_once_t sDefaultOptionsDictionaryOnceToken;
 }
 
 - (BOOL)isAnalyticsCollectionExplicitlySet {
-  // If it's de-activated, it classifies as explicity set. If not, it's not a good enough indication
-  // that the developer wants FirebaseAnalytics enabled so continue checking.
+  // If it's de-activated, it classifies as explicitly set. If not, it's not a good enough
+  // indication that the developer wants FirebaseAnalytics enabled so continue checking.
   if (self.isAnalyticsCollectionDeactivated) {
     return YES;
   }