Some bullet lists didn't render as bullet-lists because
of a missing newline.
Also added missing "label" filter for `docker ps` and
slightly re-worded the header above the supported filters.
Signed-off-by: Sebastiaan van Stijn <github@gone.nl>
Upstream-commit: 37c7f3a2046dc01c6c58ed64638faf136dd0682c
Component: engine