Added additional captive portal check domains (#22323)

Author: aw-cf

src/content/docs/cloudflare-one/connections/connect-devices/warp/deployment/firewall.mdx

@@ -73,6 +73,9 @@ The following domains are used as part of our captive portal check:
 - `cloudflareportal.com`
 - `cloudflareok.com`
 - `cloudflarecp.com`
+- `www.msftconnecttest.com`
+- `captive.apple.com`
+- `connectivitycheck.gstatic.com`
 
 ## Connectivity checks