Fixes a typo.

Author: XiangtianDai

FirebaseAuthUI/FUIAuth.m

@@ -50,7 +50,7 @@
 static NSString *const kFirebaseAuthUIFrameworkMarker = @"FirebaseUI-iOS";
 
 /** @category FIRAuth(InternalInterface)
- @brief Reclares the internal interface not publicly exposed in FIRAuth.
+ @brief Redeclares the internal interface not publicly exposed in FIRAuth.
  */
 @interface FIRAuth (InternalInterface)