Updates pip_installation.rst (#1806)

# Description
The pip command:
```
pip install isaacsim[all,extscache]==4.5.0 --extra-index-url https://pypi.nvidia.com
```
does not work because of the brackets and would give the following
error:
```
no matches found: isaacsim[all,extscache]==4.5.0
```
There exist two ways to fix this either by quoting:
```
pip install 'isaacsim[all,extscache]==4.5.0' --extra-index-url https://pypi.nvidia.com
```
or by escaping the brackets:
```
pip install isaacsim\[all,extscache\]==4.5.0 --extra-index-url https://pypi.nvidia.com
```

Fixes # (issue)

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## Type of change

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applicable. -->
-Documentation update

## Checklist

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

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Signed-off-by: samibouziri <79418773+samibouziri@users.noreply.github.com>
Co-authored-by: Kelly Guo <kellyg@nvidia.com>
Co-authored-by: Mayank Mittal <12863862+Mayankm96@users.noreply.github.com>

docs/source/setup/installation/pip_installation.rst

@@ -110,7 +110,7 @@ If you encounter any issues, please report them to the
 
    .. code-block:: none
 
-      pip install isaacsim[all,extscache]==4.5.0 --extra-index-url https://pypi.nvidia.com
+      pip install 'isaacsim[all,extscache]==4.5.0' --extra-index-url https://pypi.nvidia.com
 
 
 Verifying the Isaac Sim installation