Update index.mdx

Author: kathayl

src/content/docs/google-tag-gateway/index.mdx

@@ -47,7 +47,7 @@ Now that you have authenticated into your Cloudflare account and configured GTM
 - [Google Help Center: Set up Google tag gateway for advertisers in the Google tag with Cloudflare](https://support.google.com/tagmanager/answer/16061406)
 - [Google Help Center: Set up Google tag gateway for advertisers in Google Tag Manager with Cloudflare](https://support.google.com/analytics/answer/16061641)
 
-## FAQs
+## FAQ
 
 ### I turned off **Set up tag** on the dashboard, but the code is still being injected on my domain and subdomains. Is this expected behavior?