Update loopback-recording.md (#1069)

* Update loopback-recording.md

Fixed a typo error in command 'control mmsys.cpl'

* Update loopback-recording.md

Fixed a typo error: correct the language type of provided script, from C++ to ps1

Author: rapsealk

desktop-src/CoreAudio/loopback-recording.md

@@ -52,8 +52,8 @@ If your audio adapter contains a hardware loopback device, you can use the Windo
 
 1.  To run Mmsys.cpl, open a Command Prompt window and enter the following command:
 
-    ```C++
-    control mmsys.cpl,,1
+    ```ps1
+    control mmsys.cpl
     ```