message: Refine the sample readme.go.md
diff: @@ -23,9 +23,11 @@ These settings apply only when `--tag=package-2019-12-01 --go` is specified on t
  Please also specify `--go-sdk-folder=<path to the root directory of your azure-sdk-for-go clone>`.
  ```yaml $(tag) == 'package-2019-12-01' && $(go)
  +# NOTE: a stable tag must not contain any preview swagger files included
  # NOTE: go namespace can only consist of lower case letters, numbers and underscores
  namespace: yourservicename
  # NOTE: for special cases, you can hard code the namespace in the output-folder
  +# NOTE: the output-folder of a stable tag must not be under the preview subdirectory
  output-folder: $(go-sdk-folder)/services/$(namespace)/mgmt/2019-12-01/$(namespace)
  ```
  @@ -35,8 +37,10 @@ These settings apply only when `--tag=package-2020-07-01-preview --go` is specif
  Please also specify `--go-sdk-folder=<path to the root directory of your azure-sdk-for-go clone>`.
  ```yaml $(tag) == 'package-2020-07-01-preview' && $(go)
  +# NOTE: a preview tag must not contain at least one preview swagger file included
  # NOTE: go namespace can only consist of lower case letters, numbers and underscores
  namespace: yourservicename
  # NOTE: a preview api-version must be under the preview sub-directory
  +# NOTE: the output-folder of a preview tag must be under the preview subdirectory
  output-folder: $(go-sdk-folder)/services/preview/$(namespace)/mgmt/2020-07-01-preview/$(namespace)
  ```
  