fork existing docs to make room for two new sections for tracked input devices

Author: K-Tone

Packages/com.unity.inputsystem/Documentation~/TableOfContents.md

@@ -21,6 +21,7 @@
   * [Player Input Component](PlayerInput.md)
   * [Player Input Manager Component](PlayerInputManager.md)
   * [Input settings](Settings.md)
+  * [Tracked Input Devices](TrackedInputDevices.md)
   * [Advanced Topics]()
     * [Events](Events.md)
     * [Layouts](Layouts.md)

Packages/com.unity.inputsystem/Documentation~/TrackedInputDevices.md

@@ -0,0 +1,24 @@
+---
+uid: input-system-tracked-input-devices
+---
+# The Player Input Manager component
+
+>NOTE: The Input System package comes with a sample called `Simple Multiplayer` which you can install from the package manager UI in the Unity editor. The sample demonstrates how to use [`PlayerInputManager`](../api/UnityEngine.InputSystem.PlayerInputManager.html) to set up a simple local multiplayer scenario.
+
+The [`Player Input`](PlayerInput.md) system facilitates setting up local multiplayer games, where multiple players share a single screen and multiple controllers. You can set this up using the [`PlayerInputManager`](../api/UnityEngine.InputSystem.PlayerInputManager.html) component, which automatically manages the creation and lifetime of `PlayerInput` instances as players join and leave the game.
+
+![PlayerInputManager](Images/PlayerInputManager.png)
+
+|Property|Description|
+|--------|-----------|
+|[`Notification Behavior`](../api/UnityEngine.InputSystem.PlayerInputManager.html#UnityEngine_InputSystem_PlayerInputManager_notificationBehavior)|How the [`PlayerInputManager`](../api/UnityEngine.InputSystem.PlayerInput.html) component notifies game code about changes to the connected players. [This works the same way as for the `PlayerInput` component](PlayerInput.md#notification-behaviors).|
+|[`Join Behavior`](../api/UnityEngine.InputSystem.PlayerInputManager.html#UnityEngine_InputSystem_PlayerInputManager_joinBehavior)|Determines the mechanism by which players can join when joining is enabled. See documentation on [join behaviors](#join-behaviors).|
+|[`Player Prefab`](../api/UnityEngine.InputSystem.PlayerInputManager.html#UnityEngine_InputSystem_PlayerInputManager_playerPrefab)|A prefab that represents a player in the game. The [`PlayerInputManager`](../api/UnityEngine.InputSystem.PlayerInputManager.html) component creates an instance of this prefab whenever a new player joins. This prefab must have one [`PlayerInput`](PlayerInput.md) component in its hierarchy.|
+|[`Joining Enabled By Default`](../api/UnityEngine.InputSystem.PlayerInputManager.html#UnityEngine_InputSystem_PlayerInputManager_joiningEnabled)|While this is enabled, new players can join via the mechanism determined by [`Join Behavior`](../api/UnityEngine.InputSystem.PlayerInputManager.html#UnityEngine_InputSystem_PlayerInputManager_joinBehavior).|
+|[`Limit Number of Players`](../api/UnityEngine.InputSystem.PlayerInputManager.html#UnityEngine_InputSystem_PlayerInputManager_maxPlayerCount)|Enable this if you want to limit the number of players who can join the game.|
+|[`Max Player Count`](../api/UnityEngine.InputSystem.PlayerInputManager.html#UnityEngine_InputSystem_PlayerInputManager_maxPlayerCount)(Only shown when `Limit number of Players` is enabled.)|The maximum number of players allowed to join the game.|
+|[`Enable Split-Screen`](../api/UnityEngine.InputSystem.PlayerInputManager.html#UnityEngine_InputSystem_PlayerInputManager_splitScreen)|If enabled, each player is automatically assigned a portion of the available screen area. See documentation on [split-screen](#split-screen) multiplayer.|
+
+### Join behaviors
+
+Test

Packages/com.unity.inputsystem/InputSystem/Plugins/UI/TrackedDeviceRaycaster.cs

@@ -18,6 +18,7 @@ namespace UnityEngine.InputSystem.UI
     /// </remarks>
     [AddComponentMenu("Event/Tracked Device Raycaster")]
     [RequireComponent(typeof(Canvas))]
+    [HelpURL(InputSystem.kDocUrl + "/manual/TrackedInputDevices.html#tracked-device-raycaster")]
     public class TrackedDeviceRaycaster : BaseRaycaster
     {
         private struct RaycastHitData

Packages/com.unity.inputsystem/InputSystem/Plugins/XR/TrackedPoseDriver.cs

@@ -18,6 +18,7 @@ namespace UnityEngine.InputSystem.XR
     /// </remarks>
     [Serializable]
     [AddComponentMenu("XR/Tracked Pose Driver (Input System)")]
+    [HelpURL(InputSystem.kDocUrl + "/manual/TrackedInputDevices.html#tracked-pose-driver")]
     public class TrackedPoseDriver : MonoBehaviour, ISerializationCallbackReceiver
     {
         /// <summary>