[Style Guide] Add reserved ASNs (#28982)

Author: pedrosousa

src/content/docs/style-guide/formatting/example-values.mdx

@@ -1,30 +1,36 @@
 ---
 pcx_content_type: concept
 title: Example values
-
 ---
 
 ## DNS Domains
 
-As described in [RFC 2606](https://www.iana.org/go/rfc2606) and [RFC 6761](https://www.iana.org/go/rfc6761), a number of domains such as example.com and example.org are maintained for documentation purposes. Sometimes you also need to differentiate between a customer domain and your own application domain, so Cloudflare has also registered some domains for you to use.
+As described in [RFC 2606](https://datatracker.ietf.org/doc/html/rfc2606) and [RFC 6761](https://datatracker.ietf.org/doc/html/rfc6761), a number of domains such as `example.com` and `example.org` are maintained for documentation purposes. Sometimes you also need to differentiate between a customer domain and your own application domain, so Cloudflare has also registered some domains for you to use.
 
 Examples:
 
-* `example.com`
-* `example.org`
-* `myappexample.com`
-* `mycustomerexample.com`
+- `example.com`
+- `example.org`
+- `myappexample.com`
+- `mycustomerexample.com`
 
-IANA also maintains more example domains [documented here](https://www.iana.org/domains/reserved).
+IANA also maintains more example domains in their [domain names documentation](https://www.iana.org/domains/reserved).
 
 ## IPv4 ranges
 
-According to the Internet Engineering Task Force (IETF), there are specific [IPv4 ranges used for documentation](https://datatracker.ietf.org/doc/rfc5737/):
+According to the Internet Engineering Task Force (IETF), there are specific [IPv4 ranges used for documentation](https://datatracker.ietf.org/doc/html/rfc5737):
 
 Examples:
 
-* `192.0.2.0/24`.
-* `198.51.100.0/24`.
-* `203.0.113.0/24`.
+- `192.0.2.0/24`
+- `198.51.100.0/24`
+- `203.0.113.0/24`
 
 These IP addresses are reserved and will not take anyone to live origins.
+
+## Autonomous System Numbers (ASNs)
+
+According to the Internet Assigned Numbers Authority (IANA), there are specific [ASN ranges reserved for documentation](https://datatracker.ietf.org/doc/html/rfc5398):
+
+- `64496-64511` (16-bit ASN range)
+- `65536-65551` (32-bit ASN range)