update desc and add validation

Author: sudo87

engine/components-api/src/main/java/com/cloud/configuration/ConfigurationManager.java

@@ -68,7 +68,7 @@ public interface ConfigurationManager {
     ConfigKey<Float> HostCapacityTypeCpuMemoryWeight = new ConfigKey<>(ConfigKey.CATEGORY_ADVANCED, Float.class,
             "host.capacityType.to.order.clusters.cputomemoryweight",
             "0.5",
-            "CPU to Memory weight used for COMBINED capacityTye to order cluster and host",
+            "Weight for CPU (as a value between 0 and 1) applied to compute capacity for Pods, Clusters and Hosts for COMBINED capacityType for ordering. Weight for RAM will be (1 - weight of CPU)",
             true, ConfigKey.Scope.Global);
 
     /**

server/src/main/java/com/cloud/configuration/ConfigurationManagerImpl.java

@@ -614,6 +614,7 @@ protected void weightBasedParametersForValidation() {
         weightBasedParametersForValidation.add(CapacityManager.SecondaryStorageCapacityThreshold.key());
         weightBasedParametersForValidation.add(ClusterDrsService.ClusterDrsImbalanceThreshold.key());
         weightBasedParametersForValidation.add(ClusterDrsService.ClusterDrsImbalanceSkipThreshold.key());
+        weightBasedParametersForValidation.add(ConfigurationManager.HostCapacityTypeCpuMemoryWeight.key());
     }
 
     protected void overProvisioningFactorsForValidation() {