CONTRIBUTING.md: Fix broken links.

Signed-off-by: Eder Julian <[email protected]>

Author: ederjc

CONTRIBUTING.md

@@ -7,7 +7,7 @@ Please contribute and raise issues via the [github repository](https://github.co
 
 - Start your contribution by creating a [fork](https://github.com/Infineon/XMC-for-Arduino/fork) of this repository.
 - It's recommended to create a separate branch for your contribution in your fork.
-- Once your contribution is ready & tested, please create a [Pull Request](https://github.com/Infineon/XMC-for-Arduino/compare) to the master branch. We have some automated tests, so make sure you've browsed our [CODE CONVENTION](CODE_CONVENTION.md) and [development instructions](https://xmc-arduino.readthedocs.io/en/latest/development-instructions.html)
+- Once your contribution is ready & tested, please create a [Pull Request](https://github.com/Infineon/XMC-for-Arduino/compare) to the master branch. We have some automated tests, so make sure you've browsed our [CODE CONVENTIONS](CODE_CONVENTIONS.md) and [development instructions](https://xmc-arduino.readthedocs.io/en/latest/development-instructions.html)
 - Once we merged your changes to the master branch, they are automatically included in the next release.
 
 ## Development