label
docker system prune
This fix updates docs of `label` filter for `docker system prune`. This fix is related to #30740 and #29999, and specifically to comment https://github.com/docker/docker/pull/30740#issuecomment-293012957. Signed-off-by: Yong Tang <yong.tang.github@outlook.com> Upstream-commit: 40bb4a3b0e Component: cli
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