minor update

Author: msmimart

articles/active-directory/manage-apps/application-proxy-security.md

@@ -79,7 +79,7 @@ To improve the security of applications published by Azure AD Application Proxy,
 
 #### Azure DDoS protection service
 
-Applications published through Application Proxy are protected against Distributed Denial of Service (DDoS) attacks. **Azure DDoS protection** is a service offered with the Azure platform to protect your Azure resources from denial of service (DoS) attacks. The **Basic** service tier is automatically enabled, providing always-on traffic monitoring and real-time mitigation of common network-level attacks. A **Standard** tier is also available, offering additional mitigation capabilities that are tuned specifically to Azure Virtual Network resources. For details, see [Azure DDoS Protection Standard overview](https://docs.microsoft.com/azure/virtual-network/ddos-protection-overview).
+Applications published through Application Proxy are protected against Distributed Denial of Service (DDoS) attacks. **Azure DDoS protection** is a service offered with the Azure platform to protect your Azure resources from denial of service attacks. The **Basic** service tier is automatically enabled, providing always-on traffic monitoring and real-time mitigation of common network-level attacks. A **Standard** tier is also available, offering additional mitigation capabilities that are tuned specifically to Azure Virtual Network resources. For details, see [Azure DDoS Protection Standard overview](https://docs.microsoft.com/azure/virtual-network/ddos-protection-overview).
 
 ## Under the hood