DigitalOcean.DropletAction.create

You're seeing just the function create, go back to DigitalOcean.DropletAction module for more information.
Link to this function

create(droplet_id, opts)

Specs

Create an action for a droplet.

Example enabling backups for a droplet

iex> DigitalOcean.DropletAction.create(
...>   3164450,
...>   type: "enable_backups"
...> ) |> DigitalOcean.request()
{ :ok, %DigitalOcean.Response{} }

See the official DigitalOcean v2 API documentation for all options regarding creating a droplet action.