Fix broken link to examples. Refs #41.

Author: ivanperez-keera

documentation.md

@@ -3,7 +3,7 @@ A manual to Copilot can be downloaded [here](downloads/copilot_tutorial.pdf).
 
 Copilot comes with a set of examples as part of its distribution, available in
 the [Examples
-directory](https://github.com/Copilot-Language/Copilot/tree/master/Examples) of
+directory](https://github.com/Copilot-Language/Copilot/tree/master/copilot/examples) of
 the repository.