Fix incorrect DNS record value (#32191)

Co-authored-by: Alex Nguyen <[email protected]>

content/pages/configuring-a-custom-domain-for-your-github-pages-site/managing-a-custom-domain-for-your-github-pages-site.md

@@ -158,7 +158,7 @@ To configure an apex domain, you only need to pick a single DNS record type from
 | Apex domain<br />(`example.com`) | `A` | `@` | `185.199.108.153`<br />`185.199.109.153`<br />`185.199.110.153`<br />`185.199.111.153` |
 | Apex domain<br />(`example.com`) | `AAAA` | `@` | `2606:50c0:8000::153`<br />`2606:50c0:8001::153`<br />`2606:50c0:8002::153`<br />`2606:50c0:8003::153` |
 | Apex domain<br />(`example.com`) | `ALIAS` or `ANAME` | `@` | `USERNAME.github.io` or<br /> `ORGANIZATION.github.io` |
-| Subdomain<br />(`ww​w.example.com`,<br />`blog.example.com`) | `CNAME` | `SUBDOMAIN` | `USERNAME.github.io.` or<br /> `ORGANIZATION.github.io` |
+| Subdomain<br />(`ww​w.example.com`,<br />`blog.example.com`) | `CNAME` | `SUBDOMAIN` | `USERNAME.github.io` or<br /> `ORGANIZATION.github.io` |
 
 ## Removing a custom domain