Included additional information for using chgrp

[iam4tune]

Pull Request

Overview

This pull request added information to the chgrp information available in the workflow section for working with Shell.

Proposed Changes

The following changes were made:

Added an instance for a group owner to use setgid bit information of a parent directory, to setup file permissions for files and directories within it.

Related Issues

Fixes #644

[wwarriner]

I'm going to make this a draft for now until we can discuss. I think there is more that will need to be added, potentially. Related to a Slack conversation I posted recently, in a new issue: #694