doc: brief user documentation for completion
Signed-off-by: Nicholas Mc Guire <der.herr@hofr.at> [jc: cleaned up some spurious blank lines] Signed-off-by: Jonathan Corbet <corbet@lwn.net>
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Signed-off-by: Nicholas Mc Guire <der.herr@hofr.at> [jc: cleaned up some spurious blank lines] Signed-off-by: Jonathan Corbet <corbet@lwn.net>