Fix another dead link

Author: oleg-nenashev

docs/CONTRIBUTING.md

@@ -37,7 +37,8 @@ Then use your favorite IDE for development and testing.
 
 ## Contributing examples
 
-Please submit new examples as a pull requests to the [examples directory](./examples/).
+Please submit new examples as a pull requests to the
+[examples directory]([./examples/](https://github.com/wiremock/python-wiremock/tree/master/examples)).
 You can also also add links to external examples and tutorials to the `README.md`
 file in the directory.