chore: Updates release doc (#161)

Author: lantoli

RELEASING.md

@@ -7,7 +7,10 @@ Stable releases are managed by the [Release GitHub Action](https://github.com/mo
 
 ![Screenshot 2023-04-20 at 10 35 11](https://user-images.githubusercontent.com/5663078/233325734-0f469045-f91b-436c-8dd5-19d1e8f24c57.png)
 
-
+After the action finishes successfully you have to manually release the Go package:
+- Go to the [Go repo](https://github.com/mongodb/awscdk-resources-mongodbatlas-go) and check that the latest commit happened now with the same release as in this repo, e.g. `chore(release): v3.0.0`.
+- Go to the [Go Repo release page](https://github.com/mongodb/awscdk-resources-mongodbatlas-go/releases).
+- Select the latest release that has to be the same as the one in this repo, e.g. `awscdkresourcemongodbatlas/v3.0.0`, name will be like `v3.0.0`, click "Generate release notes" and make sure "Set as latest release" is checked.
 
 ## Versioning
 The release version is determinated based on the [Conventional Commits](https://www.conventionalcommits.org/en/v1.0.0/#summary) in that release.