Update .github/CONTRIBUTING.md

Co-Authored-By: Connor <connor@ibm.com>

Author: alisonjoseph

.github/CONTRIBUTING.md

@@ -20,7 +20,7 @@ You can request a new feature by submitting an issue to this repo. Proposed feat
 
 **Please see the Submission Guidelines below**.
 
-## Doc Fixes
+## Doc fixes
 
 If you want to help improve the docs, it's a good idea to let others know what you're working on to minimize duplication of effort. Comment on an issue to let others know what you're working on, or create a new issue if your work doesn't fit within the scope of any of the existing doc fix projects.