Make that "service" a `<literal>service</literal>`

Should it? And if so, what does the `service` provided-item contain as value?

Don't say "file" as AppStream metadata might not be retrieved as file, and this generally is a bit confusing. Usually, we use "component" here. Additionally, I try to avoid using the term "document" to refer to the text people are reading, because since there are XML documents and YAML documents as well as two types of AppStream "documents" this is confusing. So, I'd probably have written something like "The component described here is built upon...."

Duplicate text here.

Nitpick: One excessive space here... What does "manage" mean? Do you mean start? Do you mean start/restart/stop? What happens when the service is a "oneshot" unit? Maybe clarify that.