Fixed missing using for FourCC in method declaration

Author: chris-massie

Packages/com.unity.inputsystem/InputSystem/Runtime/Controls/AxisControl.cs

@@ -310,6 +310,7 @@ private float EvaluateMagnitude(float value)
             return NormalizeProcessor.Normalize(clampedValue, min, max, 0);
         }
 
+        /// <inheritdoc />
         protected override FourCC CalculateOptimizedControlDataType()
         {
             var noProcessingNeeded =

Packages/com.unity.inputsystem/InputSystem/Runtime/Controls/ButtonControl.cs

@@ -1,6 +1,7 @@
 using System;
 using System.Runtime.CompilerServices;
 using UnityEngine.InputSystem.LowLevel;
+using UnityEngine.InputSystem.Utilities;
 using UnityEngine.Scripting;
 
 ////REVIEW: introduce separate base class for ButtonControl and AxisControl instead of deriving ButtonControl from AxisControl?
@@ -378,6 +379,7 @@ internal void UpdateWasPressedEditor()
 
 #endif // UNITY_EDITOR
 
+        /// <inheritdoc />
         protected override FourCC CalculateOptimizedControlDataType()
         {
             if (clamp == Clamp.None &&