[FEATURE REQUEST] `docker compose down` does not suggest service names as completion

[bmo-at]

Description

Unlike docker compose up the down command does not suggest service names as tab completion.
This is due to a possible oversight, since a function to suggest service names exists, however its only used on the up command.

So when typing docker compose down and hitting tab, files in $PWD are being suggested instead.
The desired behavior would be to show the service names in the current project (like docker compose up <TAB> already does).