docs: clarify custom domain with user/org site (#42934)

Co-authored-by: Sharra-writes <sharra-writes@github.com>

Author: jamietanna

content/pages/configuring-a-custom-domain-for-your-github-pages-site/about-custom-domains-and-github-pages.md

@@ -34,7 +34,7 @@ We recommend always using a `www` subdomain, even if you also use an apex domain
 
 ## Using a custom domain across multiple repositories
 
-If you set a custom domain for a user or organization site, by default, the same custom domain will be used for all project sites owned by the same account. For more information about site types, see [AUTOTITLE](/pages/getting-started-with-github-pages/what-is-github-pages#types-of-github-pages-sites).
+By default, if you set a custom domain for a **user site** or **organization site**, that same custom domain will be used for all project sites owned by the same account. For more information about site types, see [AUTOTITLE](/pages/getting-started-with-github-pages/what-is-github-pages#types-of-github-pages-sites).
 
 For example, if the custom domain for your user site is `www.octocat.com`, and you have a project site with no custom domain configured that is published from a repository called `octo-project`, the {% data variables.product.prodname_pages %} site for that repository will be available at `www.octocat.com/octo-project`.