Update README.md

Updated a link.

Author: DanielaSchacherer

notebooks/pathomics/README.md

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 # Introduction to working with digital pathology images in IDC
-This repository contains a short notebook explaining how to explore available collections of pathology whole-slide images (WSIs) in the IDC. 
+This repository contains a short notebook (lung_cancer_cptac_DataExploration.ipynb) giving an idea on how to explore available collections of pathology whole-slide images (WSIs) in the IDC. 
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 More elaborate tutorials on how to train a tissue classification model can be found in the Github repository [idc-comppath-reproducibility](https://github.com/ImagingDataCommons/idc-comppath-reproducibility).