doc: correct links in contributing manual

CONTRIBUTING.md

@@ -25,15 +25,15 @@ might impact other work that is in flight.
 We also appreciate it if you take the time to update and write tests for any changes
 you submit.
 
-[e2e]: https://github.com/pact-foundation/pact-python/tree/master/examples
+[examples]: https://github.com/pact-foundation/pact-python/tree/master/examples
 
 ## Commit messages
 
-Pact Python is adopting the Conventional Changelog commit message conventions.
-Please ensure you follow the guidelines, we don't want to be that person, but
-the commit messages are very important to the automation of our release process.
+pact-python is adopting the [Conventional Commits](https://www.conventionalcommits.org)
+convention. Please ensure you follow the guidelines, we don't want to be that person,
+but the commit messages are very important to the automation of our release process.
 
-Take a look at the git history (git log) to get the gist of it.
+Take a look at the git history (`git log`) to get the gist of it.
 
 If you'd like to get some CLI assistance there is a node npm package. Example usage is:
 
@@ -44,7 +44,7 @@ npm install -g cz-conventional-changelog
 
 `git cz` to commit and `commitizen` will guide you.
 
-There is a pypi package that does similar [commitizen]: https://pypi.org/project/commitizen/.
+There is a pypi package that does similar [commitizen](https://pypi.org/project/commitizen/).
 This would make a great feature to add!
 
 ## Running the tests