Correct 'list scan' description in the examples.  The previous description was incorrect - 'list scan' does not actually do a scan, but instead lists the results of the background 'scan' cache.
Correct 'list scan' description in the examples.  The previous description
was incorrect - 'list scan' does not actually do a scan, but instead lists
the results of the background 'scan' cache.

Submitted by:	Fabian Keil (freebsd-listen of fabiankeil de) (via email)
Discussed with:	bschmidt
MFC after:	3 days

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