Modify readme.go.md 11/25/2021 (Azure#16879)

Author: Alancere

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

@@ -13,6 +13,7 @@ go:
 
 ``` yaml $(go) && $(multiapi)
 batch:
+  - tag: package-2021-07
   - tag: package-2021-01
   - tag: package-2020-12
   - tag: package-2020-02
@@ -23,6 +24,15 @@ batch:
   - tag: package-2016-06
 ```
 
+### Tag: package-2021-07 and go
+
+These settings apply only when `--tag=package-2021-07 --go` is specified on the command line.
+Please also specify `--go-sdk-folder=<path to the root directory of your azure-sdk-for-go clone>`.
+
+``` yaml $(tag)=='package-2021-07' && $(go)
+output-folder: $(go-sdk-folder)/services/recoveryservices/mgmt/2021-07-01/$(namespace)
+```
+
 ### Tag: package-2021-01 and go
 
 These settings apply only when `--tag=package-2021-01 --go` is specified on the command line.