Update CONTRIBUTING.md

Author: gem-lat

CONTRIBUTING.md

@@ -28,7 +28,7 @@ Scan through our existing issues to find one that interests you. If you find an
 ### Pull Request Process
 
 - When you're finished with the changes, create a pull request, also known as a PR.
-- Fill the [pull request template](pull_request_template.md) so that we can review your PR. This template helps reviewers to understand your changes as well as the purpose of your pull request.
+- Fill the [pull request template](Pull_request_template.md) so that we can review your PR. This template helps reviewers to understand your changes as well as the purpose of your pull request.
 - Don't forget to [link the PR to the issue](https://docs.github.com/en/issues/tracking-your-work-with-issues/linking-a-pull-request-to-an-issue) if you are solving one.
 - Increase the version numbers in any necessary files to the new version that this
   Pull Request would represent. The versioning scheme we use is [SemVer](http://semver.org/).
@@ -40,4 +40,4 @@ Scan through our existing issues to find one that interests you. If you find an
 
 The gematik team thanks you.
 
-Once your PR is merged, your contributions will be publicly visible on the [ti-messenger github page](https://github.com/gematik/api-ti-messenger). 
+Once your PR is merged, your contributions will be publicly visible on the [ti-messenger github page](https://github.com/gematik/api-ti-messenger).