Apply suggestions from code review

Author: mjang

content/nginx-one/changelog.md

@@ -41,10 +41,10 @@ With the NGINX One Console, you can now:
 Manage certificates in Config Sync Groups. The certificate can be managed or unmanaged. You can:
 
 - Add a certificate to a Config Sync Group
-- Remove a certificate from a Config Sync Group
+- Remove a deployed certificate from a Config Sync Group
 - Delete deployed certificates
 
-For more information, including warnings about risks, see our documentation on how you can [Manage certificates]({{< relref "/nginx-one/how-to/certificates/manage-certificates.md" >}})
+For more information, including warnings about risks, see our documentation on how you can [Add a file]({{< relref "/nginx-one/how-to/nginx-configs/add-file.md" >}}) [Manage certificates]({{< relref "/nginx-one/how-to/certificates/manage-certificates.md" >}})
 
 ### Revert a configuration