Fix duplicate header in launch-people-app.md

Removed duplicate header for ms-people: URI scheme reference.

Author: GrantMeStrength

hub/apps/develop/launch/launch-people-app.md

@@ -17,7 +17,6 @@ ms.localizationpriority: medium
 
 This topic describes the **ms-people:** URI scheme. Your WinUI, UWP, and other Windows desktop apps can use this URI scheme to launch the People app for specific actions.
 
-## ms-people: URI scheme reference
 ## ms-people: URI scheme reference
 
 <table>