Minor fix

Author: bistenijoker

articles/communication-services/quickstarts/voice-video-calling/local-preview-mirroring.md

@@ -14,7 +14,7 @@ ms.custom: mode-other, devx-track-js
 
 zone_pivot_groups: acs-plat-windows-android-ios
 ---
-# Overview
+# Overview: Turn off local preview mirroring
 
 **We’re excited to announce the rollout of the turn off local preview mirroring feature for the native ACS calling experience**
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