Replace Example.md

Plugins/CohTrack/Example.md

 # Example of a CohTrack execution
 
-- First download test data [here](https://gitlab.uliege.be/csl-signal-processing-laboratory/snap-plugins/-/tree/main/Plugins/CohTrack/Data)
+- First download test data [here][url_Data]
 
 - Run the tool by using the SNAP menu (Radar -> SAR Applications > click on the tool):
 
@@ -22,3 +22,5 @@
 ![Output files](../../ScShots/CohTrack/ScShot4.png)
 
 <div align="right">(<a href="#example-of-a-cohtrack-execution">back to top</a>)</div>
+
+[url_Data]: <https://gitlab.uliege.be/csl-signal-processing-laboratory/snap-plugins/-/tree/main/Plugins/CohTrack/Data>