Added helpful warning on redundancy

Author: DocGailZhou

infra/main.waf-aligned.bicepparam

@@ -17,8 +17,12 @@ param enableScaling = true
 
 //*************************************************************************************************
 // Redundancy, for azure storage and cosmos DB, set to true if you want to enable redundancy
+//    !!! Please check capacity and availability for redundancy in your desirable regions first 
+//    and set it accordingly. We recommend to set this to false if you are not sure.
+// 
 param enableRedundancy = false // If true, need to set secondaryLocation
 //param secondaryLocation = 'westus2'       // Set the secondary location for redundancy
+// 
 //*************************************************************************************************
 
 //*************************************************************************************************