message: update databoxedge java readme
diff: @@ -30,7 +30,7 @@ Please also specify `--azure-libraries-for-java-folder=<path to the root directo
  ``` yaml $(tag) == 'package-2020-05-preview' && $(java) && $(multiapi)
  java:
  namespace: com.microsoft.azure.management.databoxedge.v2020_05_01_preview
  - output-folder: $(azure-libraries-for-java-folder)/sdk/databoxedge/v2020_05_01_preview
  + output-folder: $(azure-libraries-for-java-folder)/sdk/databoxedge/mgmt-v2020_05_01_preview
  regenerate-manager: true
  generate-interface: true
  ```
  