fixed wording issue for CUSTOM_AUTH challenge

Author: yuhengshs

src/pages/[platform]/build-a-backend/auth/connect-your-frontend/switching-authentication-flows/index.mdx

@@ -189,12 +189,12 @@ if (nextStep.signInStep === 'CONFIRM_SIGN_IN_WITH_CUSTOM_CHALLENGE') {
   await confirmSignIn({ challengeResponse });
 }
 ```
-To create a CAPTCHA challenge with a Lambda Trigger, please visit [AWS Amplify Custom Auth Challenge example](/[platform]/build-a-backend/functions/examples/custom-auth-flows/) for set up instructions. 
+To create a CUSTOM_AUTH challenge with a Lambda Trigger, please visit [AWS Amplify Custom Auth Challenge example](/[platform]/build-a-backend/functions/examples/custom-auth-flows/) for set up instructions. 
 
 
 ### CAPTCHA authentication
 
-To create a CUSTOM_AUTH challenge with a Lambda Trigger, please visit [AWS Amplify Google reCAPTCHA challenge example](/[platform]/build-a-backend/functions/examples/google-recaptcha-challenge/) for detailed examples. 
+To create a CAPTCHA challenge with a Lambda Trigger, please visit [AWS Amplify Google reCAPTCHA challenge example](/[platform]/build-a-backend/functions/examples/google-recaptcha-challenge/) for detailed examples. 
 
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