Fixed TOC

Author: sreeram-venkitesh

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

@@ -8,6 +8,9 @@
   - [Goals](#goals)
   - [Non-Goals](#non-goals)
 - [Proposal](#proposal)
+  - [API](#api)
+  - [CRI API](#cri-api)
+  - [Container runtime changes](#container-runtime-changes)
   - [User Stories (Optional)](#user-stories-optional)
     - [Story 1](#story-1)
   - [Risks and Mitigations](#risks-and-mitigations)