Adding disclaimer about China Network (#1735)

Author: dcpena

products/magic-transit/src/content/index.md

@@ -10,6 +10,12 @@ pcx-content-type: landing-page
 
 Magic Transit delivers network functions at Cloudflare scale—DDoS protection, traffic acceleration, and much more from every Cloudflare data center—for on-premise, cloud-hosted, and hybrid networks.
 
+<Aside type="note" header="Note">
+
+Magic Transit is not yet supported on Cloudflare's China Network.
+
+</Aside>
+
 <ButtonGroup>
   <Button type="primary" href="/set-up">Set up Magic Transit</Button>
   <Button type="secondary" href="/about">Learn more</Button>