Fix readme.go.md

Author: Arkanayan

specification/azurestackhci/resource-manager/readme.go.md

@@ -29,12 +29,12 @@ batch:
 
 ### Tag: package-preview-2021-07 and go
 
-These settings apply only when `--tag=package-2021-07 --go` is specified on the command line.
+These settings apply only when `--tag=package-preview-2021-07 --go` is specified on the command line.
 Please also specify `--go-sdks-folder=<path to the root directory of your azure-sdk-for-go clone>`.
 
-```yaml $(tag) == 'package-preview-2027-01' && $(go)
+```yaml $(tag) == 'package-preview-2021-07' && $(go)
 namespace: azurestackhci
-output-folder: $(go-sdk-folder)/services/$(namespace)/mgmt/2021-07-01/$(namespace)
+output-folder: $(go-sdk-folder)/services/preview/$(namespace)/mgmt/2021-07-01-preview/$(namespace)
 ```
 
 ### Tag: package-2022-01 and go