fix typo and remove un-used code

Author: Xiaoshouzi-gh

FirebaseAuth/Sources/Swift/AuthProvider/PhoneAuthProvider.swift

@@ -298,7 +298,7 @@ import Foundation
 
     /// Starts the flow to verify the client via silent push notification. This is used in both
     /// .Audit and .Enforce mode
-    /// - Parameter retryOnInvalidAppCredential: Whether of not the flow should be retried if an
+    /// - Parameter retryOnInvalidAppCredential: Whether or not the flow should be retried if an
     /// AuthErrorCodeInvalidAppCredential error is returned from the backend.
     /// - Parameter phoneNumber: The phone number to be verified.
     private func verifyClAndSendVerificationCodeWithRecaptcha(toPhoneNumber phoneNumber: String,
@@ -367,7 +367,7 @@ import Foundation
 
     /// Starts the flow to verify the client via silent push notification.
     /// This method is called in Audit fallback flow with "NO_RECAPTCHA" fake token and Off flow
-    /// - Parameter retryOnInvalidAppCredential: Whether of not the flow should be retried if an
+    /// - Parameter retryOnInvalidAppCredential: Whether or not the flow should be retried if an
     /// AuthErrorCodeInvalidAppCredential error is returned from the backend.
     /// - Parameter phoneNumber: The phone number to be verified.
     private func verifyClAndSendVerificationCode(toPhoneNumber phoneNumber: String,

FirebaseAuth/Sources/Swift/Utilities/AuthRecaptchaVerifier.swift

@@ -85,6 +85,7 @@
       return _shared
     }
 
+    /// This function is only for testing.
     class func setShared(_ instance: AuthRecaptchaVerifier, auth: Auth?) {
       _shared = instance
       _ = shared(auth: auth)

FirebaseAuth/Tests/Unit/PhoneAuthProviderTests.swift

@@ -45,7 +45,6 @@
     private let kRecaptchaVersion: String = "RECAPTCHA_ENTERPRISE"
 
     static var auth: Auth?
-    // static var authRecaptchaVerifier: AuthRecaptchaVerifier
 
     /** @fn testCredentialWithVerificationID
      @brief Tests the @c credentialWithToken method to make sure that it returns a valid AuthCredential instance.