Check release version for system_prune reference topic

[mkobit]

File: engine/reference/commandline/system_prune.md

It looks like this may contain the latest builds (like possibly from moby/moby#29226) but not the current stable release (1.13.1). I would expect it to be the latest release version

➜  docker system prune --help

Usage:  docker system prune [OPTIONS]

Remove unused data

Options:
  -a, --all     Remove all unused images not just dangling ones
  -f, --force   Do not prompt for confirmation
      --help    Print usage
➜  docker system prune --filter until='3 hours ago'
unknown flag: --filter
See 'docker system prune --help'.

➜  docker image prune --help

Usage:  docker image prune [OPTIONS]

Remove unused images

Options:
  -a, --all     Remove all unused images, not just dangling ones
  -f, --force   Do not prompt for confirmation
      --help    Print usage

[alfonso-cabrera]

Working on this

[alfonso-cabrera]

The reference topic appears to be correct in not listing the --filter flag for docker system prune - it was not released with v17.03. This can be closed.

[mkobit]

Looks like it may have been fixed between when this was filed and now. Thanks for checking it out. Feel free to close!

[mdlinville]

Thanks @alfonso-cabrera