Clarify info on cert-validity-periods and add link from ACM

Author: RebeccaTamachiro

src/content/docs/ssl/edge-certificates/advanced-certificate-manager/manage-certificates.mdx

@@ -107,3 +107,9 @@ You can configure alerts to receive notifications for changes in your certificat
 />
 
 <Render file="get-started" product="notifications" />
+
+---
+
+## Advanced certificate renewal
+
+The certificate validity period you choose determines when the auto renewal will start for your certificate. For details, refer to [Validity period and renewal](/ssl/reference/certificate-validity-periods/).

src/content/docs/ssl/reference/certificate-validity-periods.mdx

@@ -13,13 +13,21 @@ description: Review information about available validity periods for your
 
 import { Render } from "~/components"
 
+For certificates managed by Cloudflare, attempts to renew start at the auto renewal period and continue up until 24 hours before expiration. The auto renewal period varies according to the certificate validity period, as explained in the sections below.
+
+If a certificate fails to renew and another valid certificate exists for the hostname, Cloudflare will deploy the valid certificate within the last 24 hours before expiration.
+
+:::note
+For information regarding custom certificates (managed by you), consider this other page on [renewal and expiration](/ssl/edge-certificates/custom-certificates/renewing/).
+:::
+
 ## Universal SSL
 
 <Render file="universal-ssl-validity" />
 
 ## Advanced certificates
 
-When you order an [advanced certificate](/ssl/edge-certificates/advanced-certificate-manager/manage-certificates/), you can select the following values for the **Certificate validity period**:
+When you order an [advanced certificate](/ssl/edge-certificates/advanced-certificate-manager/manage-certificates/), you can select different certificate validity periods. Each certificate validity period has a corresponding auto renewal period, when [attempts to renew](/ssl/reference/certificate-validity-periods/) will start.
 
 | Certificate validity period | Auto renewal period | Notes                                                                                  |
 | --------------------------- | ------------------- | -------------------------------------------------------------------------------------- |
@@ -44,12 +52,4 @@ First, shorter-lived certificates limit the damage from key compromise and mista
 
 Second, shorter certificates encourage automation. The more frequently you have to do a task, the more likely you will want to automate it. Automation also means that you are less likely to let a certificate expire in production or give a person access to key material.
 
-For more details on the benefits of shorter validity periods, refer to our [blog post introducing Advanced Certificate Manager](https://blog.cloudflare.com/advanced-certificate-manager/).
-
-## Failure to renew and certificate replacement
-
-For certificates managed by Cloudflare, attempts to renew start at the auto renewal period (based on the [different validity periods](/ssl/reference/certificate-validity-periods/#advanced-certificates)) and continue up until 24 hours before expiration.
-
-If a certificate fails to renew and another valid certificate exists for the hostname, Cloudflare will deploy the valid certificate within these last 24 hours.
-
-For information regarding custom certificates (managed by you), consider this other page on [renewal and expiration](/ssl/edge-certificates/custom-certificates/renewing/).
+For more details on the benefits of shorter validity periods, refer to our [blog post introducing Advanced Certificate Manager](https://blog.cloudflare.com/advanced-certificate-manager/).