Sebastiaan van Stijn c752d6bc2e Update system prune docs for --volumes flag
The `--volumes` flag was added in 37fd6128dc,
but the documentation was not updated.

This patch updates the documentation.

Signed-off-by: Sebastiaan van Stijn <github@gone.nl>
Upstream-commit: b4db84de69
Component: cli
2017-09-14 00:42:12 +02:00
Description
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