Update overview.md

Acro terminology: multi-cloud -> multicloud

Author: v-stsavell

articles/azure-arc/overview.md

@@ -9,7 +9,7 @@ ms.topic: overview
 
 Today, companies struggle to control and govern increasingly complex environments that extend across data centers, multiple clouds, and edge. Each environment and cloud possesses its own set of management tools, and new DevOps and ITOps operational models can be hard to implement across resources.
 
-Azure Arc simplifies governance and management by delivering a consistent multi-cloud and on-premises management platform.
+Azure Arc simplifies governance and management by delivering a consistent multicloud and on-premises management platform.
 
 Azure Arc provides a centralized, unified way to: