Cleanup WGI Xbox references

Author: morganbr

windows.gaming.input/arcadestick.md

@@ -19,7 +19,7 @@ Instances of the **ArcadeStick** class cannot be created directly; instead, inst
 
 ### Supported Devices
 
-**ArcadeStick** supports any Xbox One-certified or Xbox 360-compatible arcade stick.
+**ArcadeStick** supports any GIP or XUSB arcade stick.
 
 ### Version history
 

windows.gaming.input/flightstick.md

@@ -27,7 +27,7 @@ See [Flight stick](/windows/uwp/gaming/flight-stick) for more information about
 
 ### Supported Devices
 
-**FlightStick** supports any Xbox One-certified or Xbox 360-compatible flight stick.
+**FlightStick** supports any GIP or XUSB flight stick.
 
 ## -see-also
 

windows.gaming.input/gamepad.md

@@ -19,7 +19,7 @@ Instances of the **Gamepad** class cannot be created directly; instead, instance
 
 ### Supported Devices
 
-**Gamepad** supports any Xbox One certified or Xbox 360 compatible gamepad.
+**Gamepad** supports any GIP or XUSB compatible gamepad.
 
 ### Version history
 

windows.gaming.input/racingwheel.md

@@ -17,7 +17,7 @@ Represents a racing wheel.
 
 ### Supported Devices
 
-**RacingWheel** supports any Xbox One-certified or Xbox 360-compatible racing wheel without force feedback support.
+**RacingWheel** supports any GIP or XUSB compatible racing wheel without force feedback support.
 
 Force feedback is supported on the following device models: