fix header

Author: Han Kang

keps/sig-instrumentation/3498-extending-stability/README.md

@@ -104,7 +104,6 @@ tags, and then generate with `hack/update-toc.sh`.
   - [Version Skew Strategy](#version-skew-strategy)
 - [Production Readiness Review Questionnaire](#production-readiness-review-questionnaire)
   - [Feature Enablement and Rollback](#feature-enablement-and-rollback)
-      - [Can enabling / using this feature result in resource exhaustion of some node resources (PIDs, sockets, inodes, etc.)?](#can-enabling--using-this-feature-result-in-resource-exhaustion-of-some-node-resources-pids-sockets-inodes-etc)
   - [Rollout, Upgrade and Rollback Planning](#rollout-upgrade-and-rollback-planning)
   - [Monitoring Requirements](#monitoring-requirements)
   - [Dependencies](#dependencies)
@@ -329,7 +328,7 @@ N/A
 
 No. 
 
-##### Can enabling / using this feature result in resource exhaustion of some node resources (PIDs, sockets, inodes, etc.)?
+###### Can enabling / using this feature result in resource exhaustion of some node resources (PIDs, sockets, inodes, etc.)?
 
 No.