[Feature update notes] Fixes formatting issues

Change-Id: I6249351fa8d3a280a622720e07d15b178c781c3a
diff --git a/.releasenotes/notes/spawn-multiple-replicas-prometheus-b80eaede9c19b8cd.yaml b/.releasenotes/notes/spawn-multiple-replicas-prometheus-b80eaede9c19b8cd.yaml
index cc11b73..df15d71 100644
--- a/.releasenotes/notes/spawn-multiple-replicas-prometheus-b80eaede9c19b8cd.yaml
+++ b/.releasenotes/notes/spawn-multiple-replicas-prometheus-b80eaede9c19b8cd.yaml
@@ -1,3 +1,4 @@
+---
 summary: >
   Spawned two replicas of Prometheus to provide HA