[Docs] Add hlinks to scripts & notebooks (#111)

* add hlinks to scripts & nbs

* add colab links

* fix link

* fix link

docs/source/sentiment_tuning.mdx

@@ -4,12 +4,14 @@ The notebooks and scripts in this examples show how to fine-tune a model with a
 
 Here's an overview of the notebooks and scripts in the [trl repository](https://github.com/lvwerra/trl/tree/main/examples):
 
-| File | Description |
-|---|---|
-| `examples/notebooks/gpt2-sentiment.ipynb`  | Fine-tune GPT2 to generate positive movie reviews. |
-| `examples/notebooks/gpt2-sentiment-control.ipynb`  | Fine-tune GPT2 to generate movie reviews with controlled sentiment. |
-| `examples/scripts/gpt2-sentiment.py` | Same as the notebook, but easier to use to use in mutli-GPU setup. |
-| `examples/scripts/t5-sentiment.py` | Same as GPT2 script, but for a Seq2Seq model (T5). |
+| File | Description | Colab link |
+|---|---| --- |
+| [`gpt2-sentiment.ipynb`](https://github.com/lvwerra/trl/blob/main/examples/sentiment/notebooks/gpt2-sentiment.ipynb) | Fine-tune GPT2 to generate positive movie reviews. | [![Open In Colab](https://colab.research.google.com/assets/colab-badge.svg)](https://colab.research.google.com/github/lvwerra/trl/blob/main/examples/sentiment/notebooks/gpt2-sentiment.ipynb)
+ |
+| [`gpt2-sentiment-control.ipynb`](https://github.com/lvwerra/trl/blob/main/examples/sentiment/notebooks/gpt2-sentiment-control.ipynb)  | Fine-tune GPT2 to generate movie reviews with controlled sentiment. | [![Open In Colab](https://colab.research.google.com/assets/colab-badge.svg)](https://colab.research.google.com/github/lvwerra/trl/blob/main/examples/sentiment/notebooks/gpt2-sentiment-control.ipynb)
+  |
+| [`gpt2-sentiment.py`](https://github.com/lvwerra/trl/blob/main/examples/sentiment/scripts/gpt2-sentiment.py) | Same as the notebook, but easier to use to use in mutli-GPU setup. | x | 
+| [`t5-sentiment.py`](https://github.com/lvwerra/trl/blob/main/examples/sentiment/scripts/t5-sentiment.py) | Same as GPT2 script, but for a Seq2Seq model (T5). | x | 
 
 
 ## Installation