Update driver-parameters.md

Author: andyzhangx

docs/driver-parameters.md

@@ -69,7 +69,7 @@ pvc-92a4d7f2-f23b-4904-bad4-2cbfcff6e388
 
 Name | Meaning | Available Value | Mandatory | Default value
 --- | --- | --- | --- | ---
-volumeHandle | a value the driver can use to uniquely identify the storage blob container in the cluster. | A recommended way to produce a unique value is to combine the globally unique storage account name and container name: `{account-name}_{container-name}`. Be aware the character `#` is reserved for internal use and cannot be used in a volume handle. | Yes |
+volumeHandle | Specify a value the driver can use to uniquely identify the storage blob container in the cluster. | A recommended way to produce a unique value is to combine the globally unique storage account name and container name: {account-name}_{container-name}. Note: The # character is reserved for internal use and can't be used in a volume handle. | Yes |
 volumeAttributes.resourceGroup | Azure resource group name | existing resource group name | No | if empty, driver will use the same resource group name as current k8s cluster
 volumeAttributes.storageAccount | existing storage account name | existing storage account name | Yes |
 volumeAttributes.containerName | existing container name | existing container name | Yes |