Fix Readme.go error

Author: pvsraviteja

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

@@ -28,7 +28,7 @@ These settings apply only when `--tag=package-2021-02-01-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-2021-02-01-preview' && $(go)
-output-folder: $(go-sdk-folder)/services/$(namespace)/mgmt/2021-02-01-preview/$(namespace)
+output-folder: $(go-sdk-folder)/services/preview/$(namespace)/mgmt/2021-02-01-preview/$(namespace)
 ```
 
 ### Tag: package-2020-12-01 and go