added example for OnAdded too, uniformed the remarks section

Author: ritamerkl

Packages/com.unity.inputsystem/InputSystem/Devices/InputDevice.cs

@@ -508,10 +508,26 @@ public virtual void MakeCurrent()
         /// </summary>
         /// <remarks>
         /// This is called <em>after</em> the device has already been added.
-        /// </remarks>
         /// <seealso cref="InputSystem.devices"/>
         /// <seealso cref="InputDeviceChange.Added"/>
         /// <seealso cref="OnRemoved"/>
+        /// </remarks>
+        /// <example>
+        /// <code>
+        /// using UnityEngine.InputSystem;
+        ///
+        /// public class MyDevice : InputDevice
+        /// {
+        ///     public static MyDevice current { get; private set; }
+        ///     protected override void OnAdded()
+        ///     {
+        ///         // use this context to assign the current device for instance
+        ///         base.OnAdded();
+        ///         current = this;
+        ///     }
+        /// }
+        /// </code>
+        /// </example>
         protected virtual void OnAdded()
         {
         }
@@ -523,7 +539,7 @@ protected virtual void OnAdded()
         /// This is called <em>after</em> the device has already been removed.
         /// <seealso cref="InputSystem.devices"/>
         /// <seealso cref="InputDeviceChange.Removed"/>
-        /// <seealso cref="OnRemoved"/>
+        /// <seealso cref="OnAdded"/>
         /// </remarks>
         /// <example>
         /// <code>