Fixed TOC

Author: sreeram-venkitesh

keps/sig-node/4960-container-stop-signals/README.md

@@ -18,7 +18,6 @@
   - [Test Plan](#test-plan)
       - [Prerequisite testing updates](#prerequisite-testing-updates)
       - [Unit tests](#unit-tests)
-      - [Integration tests](#integration-tests)
       - [e2e tests](#e2e-tests)
   - [Graduation Criteria](#graduation-criteria)
     - [Alpha](#alpha)