closing issue #18753 - adding a paragraph for un-archiving a repo (#20808)

Co-authored-by: Josh Soref <2119212+jsoref@users.noreply.github.com>
Co-authored-by: SiaraMist <siaramist@github.com>
Co-authored-by: Siara <108543037+SiaraMist@users.noreply.github.com>

Author: 3 people

assets/images/help/repository/unarchive-repository-warnings.png

@@ -49,9 +49,20 @@ You can search for archived repositories. For more information, see "[Searching
 
 {% data reusables.repositories.navigate-to-repo %}
 {% data reusables.repositories.sidebar-settings %}
-3. Under "Danger Zone", click **Archive this repository** or **Unarchive this repository**.
+3. Under "Danger Zone", click **Archive this repository**
    ![Archive this repository button](/assets/images/help/repository/archive-repository.png)
 4. Read the warnings.
-5. Type the name of the repository you want to archive or unarchive.
+5. Type the name of the repository you want to archive.
   ![Archive repository warnings](/assets/images/help/repository/archive-repository-warnings.png)
 6. Click **I understand the consequences, archive this repository**.
+
+## Unarchiving a repository
+
+{% data reusables.repositories.navigate-to-repo %}
+{% data reusables.repositories.sidebar-settings %}
+3. Under "Danger Zone", click **Unarchive this repository**
+  ![Unarchive this repository button](/assets/images/help/repository/unarchive-repository.png)
+4. Read the warnings.
+5. Type the name of the repository you want to unarchive.
+  ![Unarchive repository warnings](/assets/images/help/repository/unarchive-repository-warnings.png)
+6. Click **I understand the consequences, unarchive this repository**.