chore: adding note for private models in quicktour doc

docs/source/quicktour.md

@@ -15,6 +15,13 @@ docker run --gpus all --shm-size 1g -p 8080:80 -v $volume:/data \
     --model-id $model
 ```
 
+<Tip>
+If you’re looking to serve gated or private models, which provide
+controlled access to sensitive or proprietary content, check out
+[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.