Update ICMP ping support details in documentation

Clarify ICMP ping support for Standard and Global Load Balancers.

Author: cozhang8

articles/load-balancer/load-balancer-test-frontend-reachability.md

@@ -211,7 +211,8 @@ Based on the current health probe state of your backend instances, you receive d
 
 - ICMP pings can't be disabled and are allowed by default on Standard Public Load Balancers.
 - ICMP pings with packet sizes larger than 64 bytes will be dropped, leading to timeouts.
-- Outbound ICMP pings are not supported on a Load Balancer.  
+- Outbound ICMP pings are not supported on a Standard Load Balancer.
+- ICMP pings are not support on Global or Gateway Load Balancers. 
 
 > [!NOTE]
 > ICMP ping requests are not sent to the backend instances; they are handled by the Load Balancer.