Adding note for private models in quick-tour document (#2548)

* chore: adding note for private models in quicktour doc

* Update docs/source/quicktour.md
Co-authored-by: Omar Sanseviero <osanseviero@gmail.com>

* Update docs/source/quicktour.md
Co-authored-by: vb <vaibhavs10@gmail.com>

* Update docs/source/quicktour.md
Co-authored-by: vb <vaibhavs10@gmail.com>

---------
Co-authored-by: Omar Sanseviero <osanseviero@gmail.com>
Co-authored-by: vb <vaibhavs10@gmail.com>

docs/source/quicktour.md

@@ -15,6 +15,15 @@ docker run --gpus all --shm-size 1g -p 8080:80 -v $volume:/data \
     --model-id $model
 ```
 
+<Tip>
+
+If you want to serve gated or private models, which provide
+controlled access to sensitive or proprietary content, refer to
+[this guide](https://huggingface.co/docs/text-generation-inference/en/basic_tutorials/gated_model_access)
+for detailed instructions.
+
+</Tip>
+
 ### Supported hardware
 
 TGI supports various hardware. Make sure to check the [Using TGI with Nvidia GPUs](./installation_nvidia), [Using TGI with AMD GPUs](./installation_amd), [Using TGI with Intel GPUs](./installation_intel), [Using TGI with Gaudi](./installation_gaudi), [Using TGI with Inferentia](./installation_inferentia) guides depending on which hardware you would like to deploy TGI on.