[BUG] Workstation docs do not document the always_update_cookbook flag

[damacus]

General details

Kitchen provisioner does not document the always_update_cookbook flag that is required for developing with Test Kitchen and Policyfiles.

Product

• [x] Workstation

Update Required

https://docs.chef.io/workstation/config_yml_kitchen/#provisioner-settings

Describe the update that needs to be made. Be as specific as possible:

Description of the always_update_cookbook flag. And all of it's options. Ideally someone from the workstation team needs to review the flag and description.