handles unstructured errors on redirect URLs

Author: Ivan164

Firebase/Auth/Source/AuthProviders/Phone/FIRPhoneAuthProvider.m

@@ -267,8 +267,8 @@ - (NSString *)reCAPTCHATokenForURL:(NSURL *)URL error:(NSError **)error {
     if(errorDict[@"code"] && errorDict[@"message"]) {
       reason = [NSString stringWithFormat:@"[%@] - %@",errorDict[@"code"], errorDict[@"message"]];
     } else {
-      reason = [NSString StringWithFormat:@"An unknown error occurred with the following "
-                                "response: %@", deepLinkURL];
+      reason = [NSString stringWithFormat:@"An unknown error occurred with the following "
+          "response: %@", deepLinkURL];
     }
     *error = [FIRAuthErrorUtils appVerificationUserInteractionFailureWithReason:reason];
   }