chore: minor typo fix

Author: kellertk

CONTRIBUTING.rst

@@ -65,7 +65,7 @@ will provide output on Github for anything missed locally.
 Automated Tools
 ---------------
 The use of AI tooling for assisted development work is accepted and encouraged
-in this repository, but due to the volume of sumissions we ask that you observe
+in this repository, but due to the volume of submissions we ask that you observe
 the following rules:
 
 - All issue and pull request submissions to this repository that are sourced by