rename image file

Author: vhorne

articles/firewall/compliance-certifications.md

@@ -101,7 +101,7 @@ The following Azure Firewall certifications are for Azure Government:
 
 ## ICSA Labs Corporate Firewall Certification
 
-![ICSA certification](media/overview/icsa_cert_firewall_small.png)
+![ICSA certification](media/overview/icsa-cert-firewall-small.png)
 
 ICSA Labs is a leading vendor in third-party testing and certification of security and health IT products, as well as network-connected devices. They measure product compliance, reliability, and performance for most of the world’s top technology vendors.
 

articles/firewall/media/overview/icsa_cert_firewall_small.png renamed to articles/firewall/media/overview/icsa-cert-firewall-small.png

@@ -13,7 +13,7 @@ Customer intent: As an administrator, I want to evaluate Azure Firewall so I can
 
 # What is Azure Firewall?
 
-![ICSA certification](media/overview/icsa_cert_firewall_small.png)
+![ICSA certification](media/overview/icsa-cert-firewall-small.png)
 
 Azure Firewall is a managed, cloud-based network security service that protects your Azure Virtual Network resources. It's a fully stateful firewall as a service with built-in high availability and unrestricted cloud scalability.