Add TLS decryption prerequisite to require-gateway.mdx

Author: ali2key

src/content/docs/cloudflare-one/identity/devices/warp-client-checks/require-gateway.mdx

@@ -22,7 +22,7 @@ With Require Gateway, you can allow access to your applications only to devices
   		link: "/cloudflare-one/identity/devices/warp-client-checks/",
   	}}
   />
-
+2. TLS decryption is enabled
 ## 1. Enable the Gateway check
 
 1. In [Zero Trust](https://one.dash.cloudflare.com), go to **Settings** > **WARP Client**.