[SSL for SaaS] Update O2O Provider Guides

* Update HubSpot's O2O provider guide with Zone Hold details

* Update SFCC's O2O provider guide with link to SFCC's documentation to migrate a Legacy Zone to Proxy Zone

Author: jthorne-cf

src/content/docs/cloudflare-for-platforms/cloudflare-for-saas/saas-customers/provider-guides/hubspot.mdx

@@ -40,6 +40,14 @@ For questions about your HubSpot setup, refer to [HubSpot's reverse proxy suppor
 
 <Render file="provider-guide-compatibility" />
 
+## Zone Hold
+
+Because you have your own Cloudflare zone, you have access to the zone hold feature, which is a toggle that prevents your domain name from being created as a zone in a different Cloudflare account. Additionally, if the zone hold feature is enabled, it prevents the activation of custom hostnames onboarded to HubSpot. HubSpot would see the following error message for your custom hostname: `The hostname is associated with a held zone. Please contact the owner of this domain to have the hold removed.`
+
+In order to successfully activate the custom hostname on HubSpot, the owner of the zone needs to [temporarily release the hold](/fundamentals/setup/account/account-security/zone-holds/#release-zone-holds). If you are only onboarding a subdomain as a custom hostname to HubSpot, only the subfeature titled `Also prevent Subdomains` needs to be temporarily disabled.
+
+Once the zone hold is temporarily disabled, follow HubSpot's instructions to refresh the custom hostname and it should activate.
+
 ## Additional support
 
 <Render file="provider-guide-help" params={{ one: "HubSpot" }} />

src/content/docs/cloudflare-for-platforms/cloudflare-for-saas/saas-customers/provider-guides/salesforce-commerce-cloud.mdx

@@ -29,7 +29,9 @@ For additional detail about how traffic routes when O2O is enabled, refer to [Ho
 
 To enable O2O requires the following:
 
-1. Your SFCC environment must be configured as an "SFCC Proxy Zone". If you currently have an "SFCC Legacy Zone", you cannot enable O2O. More details on the different types of SFCC configurations can be found in the [Salesforce FAQ on SFCC Proxy Zones](https://help.salesforce.com/s/articleView?id=cc.b2c_ecdn_proxy_zone_faq.htm&type=5).
+1. Your SFCC environment must be configured as an "SFCC Proxy Zone". If you currently have an "SFCC Legacy Zone", you cannot enable O2O.
+    * More details on the different types of SFCC configurations can be found in the [Salesforce FAQ on SFCC Proxy Zones](https://help.salesforce.com/s/articleView?id=cc.b2c_ecdn_proxy_zone_faq.htm&type=5).
+    * Instructions on how to migrate your SFCC environment to an "SFCC Proxy Zone" can be found [here](https://help.salesforce.com/s/articleView?id=cc.b2c_migrate_legacy_zone_to_proxy_zone.htm&type=5).
 2. Your own Cloudflare zone on an Enterprise plan.
 
 If you meet the above requirements, O2O can then be enabled per hostname. To enable O2O for a specific hostname within your Cloudflare zone, [create](/dns/manage-dns-records/how-to/create-dns-records/#create-dns-records) a Proxied CNAME DNS record with a target of the CNAME provided by SFCC Business Manager, which is the dashboard used by SFCC customers to configure their storefront environment.