Update README.md (geosolutions-it#9834)

README.md

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 ![Build Checks](https://github.com/geosolutions-it/MapStore2/actions/workflows/CI.yml/badge.svg?branch=master)
 [![Coverage Status](https://coveralls.io/repos/github/geosolutions-it/MapStore2/badge.svg?branch=master)](https://coveralls.io/github/geosolutions-it/MapStore2?branch=master)
-[![Documentation Status](https://readthedocs.org/projects/mapstore/badge/?version=latest)](https://docs.mapstore.geosolutionsgroup.com/en/latest/?badge=latest)
+[![Master Documentation Status](https://readthedocs.org/projects/mapstore/badge/?version=latest)](https://docs.mapstore.geosolutionsgroup.com/en/latest/?badge=master)
 [![Twitter URL](https://img.shields.io/twitter/url/https/twitter.com/fold_left.svg?style=social&label=Follow%20%40mapstore2)](https://twitter.com/mapstore2)
 
 MapStore is a framework to build *web mapping* applications using standard mapping libraries, such as <a href="http://openlayers.org/" target="_blank">OpenLayers</a> and <a href="http://leafletjs.com/" target="_blank">Leaflet</a>. For more information check the <a href="https://docs.mapstore.geosolutionsgroup.com/en/latest/" target="_blank">MapStore documentation!</a>