chore: remove spurious spaces at end of lines.

Author: rwiker

CONTRIBUTING.md

@@ -11,18 +11,18 @@ This is how you should do it:
 
 Use our [issue list](../../issues) to report a **bug** or **propose a new feature**, including
 
-### Reporting a **bug report**  
+### Reporting a **bug report**
 - A quick summary and/or background
 - Steps to reproduce
 - What actually happens
 
-### Adding a **feature request**  
+### Adding a **feature request**
 - Brief description of the feature
 - What problem/issue will this solve
 - A sort of Definition of Done - "How should it look when finished"
 
-### When submitting a fix using a Pull Request (PR)  
-- Fork this repository from GitHub  
-- After you have made the changes, create a pull request (PR)  
+### When submitting a fix using a Pull Request (PR)
+- Fork this repository from GitHub
+- After you have made the changes, create a pull request (PR)
 
-We will review the pull request and if it is appropriate and there are no clashes or vulnerabilities, it will be merged to the main code.
+We will review the pull request and if it is appropriate and there are no clashes or vulnerabilities, it will be merged to the main code.