Update game-switcher.md (#1563)

Change "NetPlay usage demo" section header to instead read "GameSwitcher
usage demo" for accuracy

Co-authored-by: XK <47260768+XK9274@users.noreply.github.com>

website/docs/07-apps/01-included-in-onion/game-switcher.md

@@ -43,7 +43,7 @@ Launch the GameSwitcher by pressing the <kbd>MENU</kbd> button.
 The last game played will be resumed in a few seconds, and with the simple press of a button, save your progress and turn off the console.  
 
 
-### Netplay usage demo
+### GameSwitcher usage demo
 <p align="center"><video controls><source src={NetStdHost}/></video></p>
 
 ### Controls