Updated docs on Actions for output control

Manpage now mentions specifically generating your own Action object
in order to control the output string. Calls out using None as the
command-output specifier to avoid output: Action(foo, None) and
Action(foo, cmdstr=None), as well

Userguide got a mention of using the action kwarg for readability
and an example showing creating the Action for Command manually
to set the output string.

Signed-off-by: Mats Wichmann <mats@linux.com>

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