Update service-fabric-azure-resource-manager-guardrails.md

fixing capitalization

Author: v-albemi

articles/service-fabric/service-fabric-azure-resource-manager-guardrails.md

@@ -61,11 +61,11 @@ To fix a durability mismatch, which is indicated by any of the above error messa
 2. Redeploy the Azure Resource Manager template with the updated values.
 
 
-## Seed Node Deletion 
+## Seed node deletion 
 ### Overview
 A Service Fabric cluster has a [reliability tier](https://docs.microsoft.com/azure/service-fabric/service-fabric-cluster-capacity#the-reliability-characteristics-of-the-cluster) property which is used to determine the number of replicas of system services that run on the primary node type of the cluster. The number of required replicas will determine the minimum number of nodes that must be maintained in the primary node type of the cluster. If the number of nodes in the primary node type goes below the required minimum for the reliability tier, the cluster will become unstable.  
 
-### Error Messages 
+### Error messages 
 Seed node removal operation has been detected, and will be rejected. 
 * This operation would result in only {0} potential seed nodes to remain in the cluster, while {1} are needed as a minimum.
 * Removing {0} seed nodes out of {1} would result in the cluster going down due to loss of seed node quorum. Maximum number of seed nodes that can be removed at a time is {2}.