Update XR Index page

(cherry picked from commit 327c92d3dce94e97da2ff0f6489c979037c5a8ee)

tutorials/xr/index.rst

@@ -1,6 +1,9 @@
 XR
 ==
 
+This section of the manual covers everything related to XR (
+Virtual Reality and Augmented Reality).
+
 Basic Tutorial
 --------------
 
@@ -24,8 +27,3 @@ Advanced topics
    xr_room_scale
    openxr_hand_tracking
    openxr_passthrough
-
-.. note::
-
-   Documentation for XR in Godot 4.0 XR is still a work in progress.
-   Please check back in the future.