Add link from index and enable-universal-ssl for discoverability

Author: RebeccaTamachiro

src/content/docs/ssl/edge-certificates/universal-ssl/enable-universal-ssl.mdx

@@ -10,6 +10,8 @@ import { GlossaryDefinition, Render } from "~/components"
 
 <GlossaryDefinition term="Universal SSL certificate" />
 
+---
+
 The process for activating a Universal SSL certificate depends on your domain's DNS setup.
 
 ## Full DNS setup
@@ -40,6 +42,14 @@ For non-authoritative or [partial domains](/dns/zone-setups/partial-setup/), Uni
 
 Unless you cover and validate multiple subdomains with an [advanced certificate](/ssl/edge-certificates/advanced-certificate-manager/), you will need to proxy and validate new subdomains as they are added.
 
+---
+
 ## Verify your certificate is active
 
 Once you enable Universal SSL, you can review the [activation status](/ssl/reference/certificate-statuses/) in the dashboard at **SSL/TLS** > **Edge Certificates** or via the API with a [GET request](/api/operations/certificate-packs-list-certificate-packs).
+
+---
+
+## Universal SSL renewal
+
+<Render file="universal-ssl-validity" />

src/content/docs/ssl/edge-certificates/universal-ssl/index.mdx

@@ -27,6 +27,7 @@ If your website or application requires an SSL certificate prior to migrating tr
 
 <FeatureTable id="ssl.universal_certificates" />
 
-## Backup certificates
+## Related resources
 
-For more details, refer to [backup certificates](/ssl/edge-certificates/backup-certificates/).
+- [Backup certificates](/ssl/edge-certificates/backup-certificates/)
+- [Validity period and renewal](/ssl/reference/certificate-validity-periods/#universal-ssl)