Fixed [...] repository uses GitHub Free or GitHub Free, the [...]

Added `for organizations` to fix the text rendered in https://docs.github.com/en/github/working-with-github-pages/creating-a-github-pages-site, which reads:
`If the account that owns the repository uses GitHub Free or GitHub Free, the repository must be public.`
In div#article-contents, third child, <p>

[https://github.com/github/docs/blob/main/content/github/working-with-github-pages/creating-a-github-pages-site.md]

I guess `variables.product.prodname_free_user` and `variables.product.prodname_free_team` should have different values, but I'm not sure the impact of editing these would have on the whole docs.

Got the example from div.product-callout.border-purple.bg-purple-light from the same page, that adds `for organizations`.

Author: ErnestoBorio

data/reusables/pages/new-or-existing-repo.md

@@ -1,5 +1,5 @@
 If your site is an independent project, you can create a new repository to store your site's source code. If your site is associated with an existing project, you can add the source code {% if currentVersion == "free-pro-team@latest" or currentVersion ver_gt "enterprise-server@2.22" or currentVersion == "github-ae@latest" %}to that project's repository, in a `/docs` folder on the default branch or on a different branch.{% else %}for your site to a `gh-pages` branch or a `docs` folder on the `master` branch in that project's repository.{% endif %} For example, if you're creating a site to publish documentation for a project that's already on {% data variables.product.product_name %}, you may want to store the source code for the site in the same repository as the project.
 
-{% if currentVersion == "free-pro-team@latest" %}If the account that owns the repository uses {% data variables.product.prodname_free_user %} or {% data variables.product.prodname_free_team %}, the repository must be public.{% endif %}
+{% if currentVersion == "free-pro-team@latest" %}If the account that owns the repository uses {% data variables.product.prodname_free_user %} or {% data variables.product.prodname_free_team %} for organizations, the repository must be public.{% endif %}
 
 If you want to create a site in an existing repository, skip to the "[Creating your site](#creating-your-site)" section.