Update index.mdx (#30220)

* Update index.mdx

Shrinking the note section.

* Update src/content/docs/spectrum/index.mdx

Co-authored-by: marciocloudflare <83226960+marciocloudflare@users.noreply.github.com>

---------

Co-authored-by: marciocloudflare <83226960+marciocloudflare@users.noreply.github.com>

Author: cansutopukcuCF

src/content/docs/spectrum/index.mdx

@@ -31,7 +31,9 @@ Spectrum provides security and acceleration for any [TCP](https://www.cloudflare
 
 Spectrum allows you to route MQTT, email, file transfer, version control, games, and more over TCP or UDP through Cloudflare to mask the origin and protect it from [DDoS attacks](https://www.cloudflare.com/learning/ddos/what-is-a-ddos-attack/).
 
-**Note:** Custom TCP/UDP applications require an Enterprise plan with Spectrum as a paid add-on. See [Protocols per plan](/spectrum/protocols-per-plan/) for details, or contact your account team to enable.
+:::note
+Custom TCP/UDP applications require an Enterprise plan with Spectrum as a paid add-on. See [Protocols per plan](/spectrum/protocols-per-plan/) for details, or contact your account team to enable.
+:::
 ---
 
 ## Features