DOCS: Update documentation for MonoBehaviour OnMouse events (ISX-2383) (#2301)

Co-authored-by: JonMUnity <[email protected]>

Author: ritamerkl

Packages/com.unity.inputsystem/CHANGELOG.md

@@ -10,6 +10,10 @@ however, it has to be formatted properly to pass verification tests.
 
 ## [Unreleased] - yyyy-mm-dd
 
+### Changed
+
+- Updated documentation to reflect that the OnMouse MonoBehaviour events are now supported in Unity 6.4 and above.
+
 ### Fixed
 
 - Fixed warnings being generated on Unity 6.4 and 6.5. (ISX-2395).

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

@@ -34,5 +34,4 @@ The following is a list of known limitations that the Input System currently has
 
 ## Features Supported by Old Input Manager
 
-* `MonoBehaviour` mouse methods (`OnMouseEnter`, `OnMouseDrag`, etc) will not be called by the Input System.
 * Unity Remote doesn't currently support the Input System. This is being worked on.

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

@@ -99,6 +99,8 @@ Directly reading hardware controls bypasses the new Input System's action-based
 
 ### Mouse
 
+`MonoBehaviour.OnMouse` events, such as [MonoBehaviour.OnMouseDown](https://docs.unity3d.com/ScriptReference/MonoBehaviour.OnMouseDown.html), are supported in Unity 6.4 and later.
+
 |Input Manager (Old)|Input System (New)|
 |--|--|
 [`Input.GetMouseButton`](https://docs.unity3d.com/ScriptReference/Input.GetMouseButton.html)<br/>Example: `Input.GetMouseButton(0)`|Use [`isPressed`](xref:UnityEngine.InputSystem.Controls.ButtonControl.isPressed) on the corresponding mouse button.<br/>Example: `InputSystem.Mouse.current.leftButton.isPressed`