Adding fips docs to nav (#206935)

## Summary

I recently added FIPS Test Failure Debugging docs, but forgot to add
them to the nav bar

dev_docs/nav-kibana-dev.docnav.json

@@ -197,6 +197,9 @@
         {
           "id": "kibDevTutorialDebugging"
         },
+        {
+          "id": "kibDevTutorialDebuggingFipsTestFailures"
+        },
         {
           "id": "kibDevTutorialBuildingDistributable",
           "label": "Building a Kibana distributable"