[docs]: The term "module" does not appear to be rigorously defined in the documentation

# Documentation request
https://cloudinit.readthedocs.io/en/latest/reference/modules.html

A simple summary might be: "scripts that can be run via configuration options". A reasonable place to provide this definition might be in the "Tutorials" section in an "Overview" sub-section.

Sources that might provide additional input on providing a simple definition:

see:
https://cloudinit.readthedocs.io/en/latest/development/module_creation.html
https://wiki.archlinux.org/title/Cloud-init#Modules
https://www.hashicorp.com/resources/cloudinit-the-good-parts