unused-for is a deprecated synonym for until

[sj26]

- What I did

Change unused-for to until in docker builder prune --help output, which should flow through to the docs site.

- How I did it

Modifying the command flag description.

- How to verify it

Run docker builder prune --help

- Description for the changelog

Fixed deprecated docker builder prune filter example

- A picture of a cute animal (not mandatory but encouraged)

[thaJeztah]

Thanks! this should probably also remove the term from the completion script;

cli/contrib/completion/bash/docker

Line 1230 in 3fa5aef

COMPREPLY=( $( compgen -S = -W "description id inuse parent private shared type until unused-for" -- "$cur" ) )

However, I'm a bit hazy on this one; I recall there were some issues with docker builder prune vs docker prune (last one could only support "generic" filters supported by all object types, so perhaps until was mainly added as an alias so that it would work in that case). And I know this was renamed from max-age at some point; #1451

ping @tiborvass could you help out on this one?

[thaJeztah]

Also; nice to see you here! I used your "mailcatcher" quite a bit in a previous job 🤗 👍

[kolyshkin]

LGTM