Updates cloudxr teleop known issue documentation (isaac-sim#3639)

# Description

Updates cloudxr teleop doc to address:

- [[VDR][Isaac Lab][2.2] HW and SW compatibility requirements at the
top](https://nvbugswb.nvidia.com/NVBugs5/redir.aspx?url=/5460521)
- [[VDR][Isaac Lab][2.2] Collecting human demonstrations in VR still
presents a learning
curve](https://nvbugswb.nvidia.com/NVBugs5/redir.aspx?url=/5460510)
- [[Isaac-Sim 5.0 rc8][Isaac-Lab 2.2 internal][Mimic]
XR_ERROR_INSTANCE_LOST in
xrPollEvent](https://nvbugswb.nvidia.com/NVBugs5/redir.aspx?url=/5305422)
- `NV_GPU_INDEX` issues

## Type of change

- Documentation update

## Checklist

- [x] I have read and understood the [contribution
guidelines](https://isaac-sim.github.io/IsaacLab/main/source/refs/contributing.html)
- [x] I have run the [`pre-commit` checks](https://pre-commit.com/) with
`./isaaclab.sh --format`
- [x] I have made corresponding changes to the documentation
- [ ] My changes generate no new warnings
- [ ] I have added tests that prove my fix is effective or that my
feature works
- [ ] I have updated the changelog and the corresponding version in the
extension's `config/extension.toml` file
- [x] I have added my name to the `CONTRIBUTORS.md` or my name already
exists there

Author: tifchen-nvda

docs/source/how-to/cloudxr_teleoperation.rst

@@ -63,16 +63,13 @@ Prior to using CloudXR with Isaac Lab, please review the following system requir
   * Isaac Lab workstation
 
     * Ubuntu 22.04 or Ubuntu 24.04
+    * Hardware requirements to sustain 45 FPS with a 120Hz physics simulation:
+       * CPU: 16-Cores AMD Ryzen Threadripper Pro 5955WX or higher
+       * Memory: 64GB RAM
+       * GPU: 1x RTX PRO 6000 GPUs (or equivalent e.g. 1x RTX 5090) or higher
+    * For details on driver requirements, please see the `Technical Requirements <https://docs.omniverse.nvidia.com/materials-and-rendering/latest/common/technical-requirements.html>`_ guide
     * `Docker`_ 26.0.0+, `Docker Compose`_ 2.25.0+, and the `NVIDIA Container Toolkit`_. Refer to
       the Isaac Lab :ref:`deployment-docker` for how to install.
-    * For details on driver requirements, please see the `Technical Requirements <https://docs.omniverse.nvidia.com/materials-and-rendering/latest/common/technical-requirements.html>`_ guide
-    * CPU
-       * Intel: 16-core Intel Core i9, X-series or higher
-       * AMD: Ryzen 9 5900XT, Ryzen Threadripper PRO 5955WX or higher
-    * Memory: 64GB RAM
-    * GPU
-       * Minimum: 1x RTX PRO 6000 GPUs (or equivalent e.g. 1x RTX 5090)
-       * Recommended: 2x RTX PRO 6000 GPUs (or equivalent e.g. 2x RTX 5090)
 
   * Apple Vision Pro
 
@@ -282,11 +279,11 @@ On your Mac:
    +-------------------+---------------------+
    | Isaac Lab Version | Client App Version  |
    +-------------------+---------------------+
-   | 2.3.x             | v2.3.0              |
+   | 2.3               | v2.3.0              |
    +-------------------+---------------------+
-   | 2.2.x             | v2.2.0              |
+   | 2.2               | v2.2.0              |
    +-------------------+---------------------+
-   | 2.1.x             | v1.0.0              |
+   | 2.1               | v1.0.0              |
    +-------------------+---------------------+
 
    .. code-block:: bash
@@ -988,6 +985,11 @@ Known Issues
   This error message can be safely ignored. It is caused by a race condition in the exit handler for
   AR Mode.
 
+* ``XR_ERROR_INSTANCE_LOST in xrPollEvent: Call to "xrt_session_poll_events" failed``
+
+  This error may occur if the CloudXR runtime exits before Isaac Lab. Restart the CloudXR
+  runtime to resume teleoperation.
+
 * ``[omni.usd] TF_PYTHON_EXCEPTION`` when starting/stopping AR Mode
 
   This error message can be safely ignored. It is caused by a race condition in the enter/exit
@@ -998,6 +1000,13 @@ Known Issues
   This error message can be caused by shader assets authored with older versions of USD, and can
   typically be ignored.
 
+* The XR device connects successfully, but no video is displayed, even though the Isaac Lab viewport responds to tracking.
+
+  This error occurs when the GPU index differs between the host and the container, causing CUDA
+  to load on the wrong GPU. To fix this, set ``NV_GPU_INDEX`` in the runtime container to ``0``, ``1``,
+  or ``2`` to ensure the GPU selected by CUDA matches the host.
+
+
 Kubernetes Deployment
 ---------------------
 

docs/source/overview/imitation-learning/teleop_imitation.rst

@@ -61,7 +61,7 @@ For tasks that benefit from the use of an extended reality (XR) device with hand
 
 .. note::
 
-   See :ref:`cloudxr-teleoperation` to learn more about using CloudXR with Isaac Lab.
+   See :ref:`cloudxr-teleoperation` to learn how to use CloudXR and experience teleoperation with Isaac Lab.
 
 
 The script prints the teleoperation events configured. For keyboard,