Adds missing torch and rl-games installation for pip installed lab (#549)

# Description

Adds back some missing installation commands for installing torch (for
Windows) and rl-games (since this is no longer available as a pip
package) for pip installation of Isaac Lab.


## Type of change

- This change requires a documentation update

## Checklist

- [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
- [x] 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
- [ ] I have added my name to the `CONTRIBUTORS.md` or my name already
exists there

<!--
As you go through the checklist above, you can mark something as done by
putting an x character in it

For example,
- [x] I have done this task
- [ ] I have not done this task
-->

docs/source/setup/installation/isaaclab_pip_installation.rst

@@ -50,6 +50,21 @@ To learn about how to set up your own project on top of Isaac Lab, see :ref:`tem
                   # activate the virtual environment
                   env_isaaclab\Scripts\activate
 
+
+-  Next, install a CUDA-enabled PyTorch 2.7.0 build for CUDA 12.8. This step is optional for Linux, but required for Windows to ensure a CUDA-compatible version of PyTorch is installed.
+
+   .. code-block:: bash
+
+      pip install torch==2.7.0 torchvision==0.22.0 --index-url https://download.pytorch.org/whl/cu128
+
+
+-  If using rl_games for training and inferencing, install the following python 3.11 enabled rl_games fork.
+
+   .. code-block:: bash
+
+      pip install git+https://github.com/kellyguo11/rl_games.git@python3.11
+
+
 -  Before installing Isaac Lab, ensure the latest pip version is installed. To update pip, run
 
    .. tab-set::