The documentation on `docker export` doesn't mention that
data in volumes is not included in the export.
This adds a note that volumes are not part of the export
and refers to the "Backup, restore, or migrate data volumes"
to give the user some pointers.
Relates to https://github.com/docker/docker/issues/10095
Signed-off-by: Sebastiaan van Stijn <github@gone.nl>
Upstream-commit: 67588d0ec4d73a8f2efb150d555c38b7ebfca7f6
Component: engine
3abcc54bab