[MacPorts] #16061: Update port.1 man page for clearer description of -f and the state file

[MacPorts]

#16061: Update port.1 man page for clearer description of -f and the state file
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  Reporter:  blb@…   |      Owner:  macports-tickets@…
      Type:  defect  |     Status:  new
  Priority:  Normal  |  Milestone:  MacPorts Future
 Component:  base    |    Version:  1.6.0
Resolution:          |   Keywords:  port man page
      Port:          |
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Comment (by translatezilla2):

 Oh great
 allows a build to continue with different variants than it was started
 with
 allows ports with files that conflict with what's already there to be
 activated
 allows ports with dependents to be uninstalled
 ----
 #16061 [https://goo.gl/XVUN7p]

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Ticket URL: <https://trac.macports.org/ticket/16061#comment:5>
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