fix typo (#1892)

Author: jwilliams-mongo

snooty.toml

@@ -188,7 +188,7 @@ multi-cluster-appdb = "multi-cluster Application Database deployment"
 multi-cluster = "multi-Kubernetes cluster MongoDB deployment"
 Multi-cluster = "Multi-Kubernetes cluster MongoDB deployment"
 multi-clusters = "multi-Kubernetes cluster MongoDB deployments"
-Multi-clusters = "Multi-Kubernetes cluster MongoBB deployments"
+Multi-clusters = "Multi-Kubernetes cluster MongoDB deployments"
 kubectl-mongodb = "``kubectl mongodb`` plugin"
 onprem = "Ops Manager"
 onprem-link = ":opsmgr:`Ops Manager </>`"