[MacPorts] #46164: Unnecessary warning

[MacPorts]

#46164: Unnecessary warning
----------------------+--------------------------------
 Reporter:  matteo@…  |      Owner:  macports-tickets@…
     Type:  defect    |     Status:  new
 Priority:  Normal    |  Milestone:
Component:  base      |    Version:  2.3.3
 Keywords:            |       Port:
----------------------+--------------------------------
 {{{
 port list outdated
 }}}

 always issues the warining

 {{{
 Warning: The 'list' action only shows the currently available version of
 each port. To see installed versions, use the 'installed' action.
 }}}

 The installed packages and the outdated ones are two different things.
 Suggesting to use `installed` instead of `outdated` is like comparing
 apple to oranges.

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Ticket URL: <https://trac.macports.org/ticket/46164>
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