message: fix eventgrid package path for Go SDK
diff: @@ -29,7 +29,7 @@ These settings apply only when `--tag=package-2019-06 --go` is specified on the
  Please also specify `--go-sdk-folder=<path to the root directory of your azure-sdk-for-go clone>`.
  ``` yaml $(tag) == 'package-2019-06' && $(go)
  -output-folder: $(go-sdk-folder)/services/stable/$(namespace)/mgmt/2019-06-01/$(namespace)
  +output-folder: $(go-sdk-folder)/services/$(namespace)/mgmt/2019-06-01/$(namespace)
  ```
  ### Tag: package-2019-02-preview and go
  