Small text changes - trailing spaces and update year (#6022)

* remove trailing spaces

* update year

CONTRIBUTING.md

@@ -1,12 +1,12 @@
 # Code Contribution Guidelines
 
-Thank you for your interest in contributing! Please see the [Mattermost Contribution Guide](http://docs.mattermost.com/developer/contribution-guide.html) which describes the process for making code contributions across Mattermost projects. 
+Thank you for your interest in contributing! Please see the [Mattermost Contribution Guide](http://docs.mattermost.com/developer/contribution-guide.html) which describes the process for making code contributions across Mattermost projects.
 
 ### Review Process for this Repo
 
 When you submit a pull request, it goes through the review process outlined below. We aim to start reviewing pull requests in this repo the week they are submitted, but the length of time to complete the process will vary depending on the pull request.
 
-The one exception may be around release time, where the review process may take longer as the team focuses on our [release process](https://docs.mattermost.com/process/release-process.html). 
+The one exception may be around release time, where the review process may take longer as the team focuses on our [release process](https://docs.mattermost.com/process/release-process.html).
 
 #### PR submitted