docs: Added colab link in the Read me for artefact detection (#755)

* docs: Added colab link in the Read me for artefact detection

* fix: Fixed a typo

notebooks/README.md

@@ -6,3 +6,4 @@ Here are some notebooks compiled for users to better leverage the library capabi
 |:----------|:-------------|------:|
 | [Quicktour](https://github.com/mindee/notebooks/blob/main/doctr/quicktour.ipynb) | A presentation of the main features of docTR | [![Open In Colab](https://colab.research.google.com/assets/colab-badge.svg)](https://colab.research.google.com/github/mindee/notebooks/blob/main/doctr/quicktour.ipynb) |
 | [Export as PDF/A](https://github.com/mindee/notebooks/blob/main/doctr/export_as_pdfa.ipynb) | Produce searchable PDFs from docTR results | [![Open In Colab](https://colab.research.google.com/assets/colab-badge.svg)](https://colab.research.google.com/github/mindee/notebooks/blob/main/doctr/export_as_pdfa.ipynb) |
+[Artefact detection](https://github.com/mindee/notebooks/blob/main/doctr/artefact_detection.ipynb) | Object detection for artefacts in documents | [![Open In Colab](https://colab.research.google.com/assets/colab-badge.svg)](https://colab.research.google.com/github/mindee/notebooks/blob/main/doctr/artefact_detection.ipynb) |