update description for netapp (#13055)

Author: weidongxu-microsoft

specification/netapp/resource-manager/readme.java.md

@@ -4,6 +4,8 @@ These settings apply only when `--java` is specified on the command line.
 Please also specify `--azure-libraries-for-java-folder=<path to the root directory of your azure-libraries-for-java clone>`.
 
 ``` yaml $(java)
+service-name: NetAppFiles
+
 azure-arm: true
 fluent: true
 namespace: com.microsoft.azure.management.netapp

specification/netapp/resource-manager/readme.md

@@ -26,7 +26,7 @@ These are the global settings for the Azure NetApp Files API.
 
 ``` yaml
 title: NetAppManagementClient
-description: Microsoft NetApp Azure Resource Provider specification
+description: Microsoft NetApp Files Azure Resource Provider specification
 openapi-type: arm
 tag: package-netapp-2020-11-01
 ```