[ReleasePR containerservice] Improve desire count desc (#1936)

Create to sync Azure/azure-rest-api-specs#16155
[ReCreate this PR](https://github.com/azure-resource-manager-schemas/compare/main...AzureSDKAutomation:sdkAuto/containerservice?expand=1)

Author: msftbot[bot]

schemas/2021-08-01/Microsoft.ContainerService.json

@@ -879,7 +879,7 @@
               "$ref": "https://schema.management.azure.com/schemas/common/definitions.json#/definitions/expression"
             }
           ],
-          "description": "Number of agents (VMs) to host docker containers. Allowed values must be in the range of 0 to 1000 (inclusive) for user pools and in the range of 1 to 1000 (inclusive) for system pools. The default value is 1."
+          "description": "Desired Number of agents (VMs) specified to host docker containers. Allowed values must be in the range of 0 to 1000 (inclusive) for user pools and in the range of 1 to 1000 (inclusive) for system pools. The default value is 1."
         },
         "creationData": {
           "oneOf": [
@@ -1311,7 +1311,7 @@
               "$ref": "https://schema.management.azure.com/schemas/common/definitions.json#/definitions/expression"
             }
           ],
-          "description": "Number of agents (VMs) to host docker containers. Allowed values must be in the range of 0 to 1000 (inclusive) for user pools and in the range of 1 to 1000 (inclusive) for system pools. The default value is 1."
+          "description": "Desired Number of agents (VMs) specified to host docker containers. Allowed values must be in the range of 0 to 1000 (inclusive) for user pools and in the range of 1 to 1000 (inclusive) for system pools. The default value is 1."
         },
         "creationData": {
           "oneOf": [