updated asn language (#23314)

Author: marciocloudflare

src/content/docs/byoip/concepts/loa.mdx

@@ -16,7 +16,7 @@ A Letter of Agency (LOA) - sometimes referred to as a Letter of Authorization -
 The letter must contain both the prefixes you are authorizing Cloudflare to announce and which ASN they will be announced under. Cloudflare can announce a prefix under your ASN or you can use Cloudflare's ASN, which is AS13335.
 
 :::note
-Current customers who are still using Cloudflare's AS209242 can continue using this same ASN. No further change is required.
+For all future onboardings, you must use AS13335. Current customers who are already using Cloudflare's AS209242 do not need to make any changes and can continue using that ASN.
 :::
 
 Cloudflare accepts digital signatures on an LOA, as long as it is clear who is signing the LOA.

src/content/docs/magic-transit/how-to/advertise-prefixes.mdx

@@ -37,7 +37,7 @@ As a part of your onboarding process, you need to decide the ASN Cloudflare will
 If you do not have an ASN or do not want to bring your ASN to Cloudflare, you can use the Cloudflare Customer ASN (AS13335).
 
 :::note
-Current customers who are still using Cloudflare's AS209242 can continue using this same ASN. No further change is required.
+For all future onboardings, you must use AS13335. Current customers who are already using Cloudflare's AS209242 do not need to make any changes and can continue using that ASN.
 :::
 
 ## Advertise or withdraw a prefix