This adds the `--live-restore` option to the documentation.
Also synched usage description in the documentation
with the actual description, and re-phrased some
flag descriptions to be a bit more consistent.
Signed-off-by: Sebastiaan van Stijn <github@gone.nl>
(cherry picked from commit 64a8317a5a306dffd0ec080d9ec5b4ceb2479a01)
Signed-off-by: Tibor Vass <tibor@docker.com>