Add missing monospace and call out API-only

Author: RebeccaTamachiro

src/content/docs/cloudflare-for-platforms/cloudflare-for-saas/security/certificate-management/custom-certificates/uploading-certificates.mdx

@@ -49,7 +49,7 @@ EOF
 ))
 ```
 
-2. Use a [POST request](/api/resources/custom_hostnames/methods/create/) to upload your certificate and key.
+2. Use a [`POST` request](/api/resources/custom_hostnames/methods/create/) to upload your certificate and key.
 
 :::note
 The serial number returned is unique to the issuer, but not globally unique. Additionally, it is returned as a string, not an integer.
@@ -59,11 +59,11 @@ The serial number returned is unique to the issuer, but not globally unique. Add
 
 ## Use certificate packs: RSA and ECDSA
 
-A certificate pack allows you to upload up to one RSA and one ECDSA custom certificates.
+A certificate pack allows you to upload up to one RSA and one ECDSA custom certificates to a custom hostname. This process is currently only supported via API.
 
-To upload an RSA and ECDSA certificate to a custom hostname, use the `custom_cert_bundle` property when making a POST request to the [Create Custom Hostname](/api/resources/custom_hostnames/methods/create/) endpoint.
+To upload an RSA and ECDSA certificate to a custom hostname, use the `custom_cert_bundle` property when making a `POST` request to the [Create Custom Hostname](/api/resources/custom_hostnames/methods/create/) endpoint.
 
-You can also use `custom_cert_bundle` with a PATCH request to the [Edit Custom Hostname](/api/resources/custom_hostnames/methods/edit/) endpoint.
+You can also use `custom_cert_bundle` with a `PATCH` request to the [Edit Custom Hostname](/api/resources/custom_hostnames/methods/edit/) endpoint.
 
 ### Delete a custom certificate and private key
 
@@ -83,4 +83,4 @@ You can only replace an RSA certificate with another RSA certificate, or an ECDS
 
 If you want to switch from maintaining a custom certificate to using one issued by Cloudflare, you can migrate that certificate with zero downtime.
 
-Send a [PATCH request](/api/resources/custom_hostnames/methods/edit/) to your custom hostname with a value for the DCV `method`. As soon as the [certificate is validated](/cloudflare-for-platforms/cloudflare-for-saas/security/certificate-management/issue-and-validate/) and the [hostname is validated](/cloudflare-for-platforms/cloudflare-for-saas/domain-support/hostname-validation/), Cloudflare will remove the old custom certificate and begin serving the new one.
+Send a [`PATCH` request](/api/resources/custom_hostnames/methods/edit/) to your custom hostname with a value for the DCV `method`. As soon as the [certificate is validated](/cloudflare-for-platforms/cloudflare-for-saas/security/certificate-management/issue-and-validate/) and the [hostname is validated](/cloudflare-for-platforms/cloudflare-for-saas/domain-support/hostname-validation/), Cloudflare will remove the old custom certificate and begin serving the new one.