Please see here for an overview of the resources that you may need to use to create or update documentation.
https://github.com/apache/cloudstack-docs-install.git is the install guide
https://github.com/apache/cloudstack-docs-admin.git is the current admin manual.
https://github.com/apache/cloudstack-docs-rn.git is the release notes for individual releases
Here are the steps to create a PR the