improve wording around ipv6 support (#36404)

Co-authored-by: Laura Coursen <[email protected]>

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

@@ -80,7 +80,7 @@ To set up an apex domain, such as `example.com`, you must configure a custom dom
 {% data reusables.repositories.sidebar-settings %}
 {% data reusables.pages.sidebar-pages %}
 4. Under "Custom domain", type your custom domain, then click **Save**. If you are publishing your site from a branch, this will create a commit that adds a `CNAME` file to the root of your source branch. If you are publishing your site with a custom {% data variables.product.prodname_actions %} workflow , no `CNAME` file is created. For more information about your publishing source, see "[AUTOTITLE](/pages/getting-started-with-github-pages/configuring-a-publishing-source-for-your-github-pages-site)."
-5. Navigate to your DNS provider and create either an `ALIAS`, `ANAME`, or `A` record. You can also create `AAAA` records for IPv6 support. {% data reusables.pages.contact-dns-provider %}
+5. Navigate to your DNS provider and create either an `ALIAS`, `ANAME`, or `A` record. You can also create `AAAA` records for IPv6 support. If you're implementing IPv6 support, we highly recommend using an `A` record in addition to your `AAAA` record, due to slow adoption of IPv6 globally. {% data reusables.pages.contact-dns-provider %}
     - To create an `ALIAS` or `ANAME` record, point your apex domain to the default domain for your site. {% data reusables.pages.default-domain-information %}
     - To create `A` records, point your apex domain to the IP addresses for {% data variables.product.prodname_pages %}.
       ```shell
@@ -100,22 +100,24 @@ To set up an apex domain, such as `example.com`, you must configure a custom dom
 {% indented_data_reference reusables.pages.wildcard-dns-warning spaces=3 %}
 {% data reusables.command_line.open_the_multi_os_terminal %}
 6. To confirm that your DNS record configured correctly, use the `dig` command, replacing _EXAMPLE.COM_ with your apex domain. Confirm that the results match the IP addresses for {% data variables.product.prodname_pages %} above.
-   - For `A` records.
+   - For `A` records:
     ```shell
     $ dig EXAMPLE.COM +noall +answer -t A
     > EXAMPLE.COM    3600    IN A     185.199.108.153
     > EXAMPLE.COM    3600    IN A     185.199.109.153
     > EXAMPLE.COM    3600    IN A     185.199.110.153
     > EXAMPLE.COM    3600    IN A     185.199.111.153
     ```
-   - For `AAAA` records.
+   - For `AAAA` records:
     ```shell
     $ dig EXAMPLE.COM +noall +answer -t AAAA
     > EXAMPLE.COM     3600    IN AAAA     2606:50c0:8000::153
     > EXAMPLE.COM     3600    IN AAAA     2606:50c0:8001::153
     > EXAMPLE.COM     3600    IN AAAA     2606:50c0:8002::153
     > EXAMPLE.COM     3600    IN AAAA     2606:50c0:8003::153
     ```
+
+      Remember to also check your `A` record.
 {% data reusables.pages.build-locally-download-cname %}
 {% data reusables.pages.enforce-https-custom-domain %}