Add summary to TOC

Author: Kate Osborn

tests/graceful-recovery/results/1.1.0/1.1.0.md

@@ -2,6 +2,7 @@
 
 <!-- TOC -->
 - [Results for v1.1.0](#results-for-v110)
+  - [Summary](#summary)
   - [Versions](#versions)
   - [Tests](#tests)
     - [Restart nginx-gateway container](#restart-nginx-gateway-container)