Update prefix-delegations.mdx

add note about valid IP ranges for IP delegation

Author: chris-martinelli

src/content/docs/byoip/concepts/prefix-delegations.mdx

@@ -10,6 +10,10 @@ BYOIP supports prefix delegations, which occur when a prefix owner account (Acco
 
 The effect of a delegation depends on the service used with the prefix. Currently BYOIP + CDN and BYOIP + Spectrum support prefix delegations.
 
+:::note
+Delegations can range from a /24 all the way down to a /32
+:::
+
 ## CDN
 
 CDN delegations only have an effect if you are using [Cloudflare for SaaS](/cloudflare-for-platforms/cloudflare-for-saas/security/certificate-management/) in addition to BYOIP + CDN.