Fix output folder of go sdk in adp (Azure#11862)

* fix output folder in adp

* add the missing multiapi part

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

@@ -9,11 +9,18 @@ go:
   clear-output-folder: true
 ```
 
+### Go multi-api
+
+``` yaml $(go) && $(multiapi)
+batch:
+  - tag: package-2020-07-01-preview
+```
+
 ### Tag: package-2020-07-01-preview and go
 
 These settings apply only when `--tag=package-2020-07-01-preview --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-2020-07-01-preview' && $(go)
-output-folder: $(go-sdk-folder)/services/preview/adp/mgmt/2019-07-01-preview
+output-folder: $(go-sdk-folder)/services/preview/$(namespace)/mgmt/2019-07-01-preview/$(namespace)
 ```