[MacPorts] #39051: The example portfile in the "doc" folder of base should pass lint

[MacPorts]

#39051: The example portfile in the "doc" folder of base should pass lint
---------------------+--------------------------------
 Reporter:  egall@…  |      Owner:  macports-tickets@…
     Type:  defect   |     Status:  new
 Priority:  Normal   |  Milestone:
Component:  base     |    Version:  2.1.3
 Keywords:           |       Port:  exampleport
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 `port -v lint --nitpick` reports the following problems for
 doc/exampleport/Portfile:
 {{{
 Warning: Line 1 is missing RCS tag ($Id$)
 Warning: Variant puredarwin does not have a description
 Warning: Maintainer email address for ryandesign includes @macports.org
 Warning: no license set
 Error: Portfile parent directory doc does not match primary category devel
 Error: Portfile directory exampleport does not match port name glib2
 --->  2 errors and 4 warnings found.
 }}}
 Also `port lint` doesn't warn about missing modelines, but it'd probably
 be a good idea to add one.

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Ticket URL: <https://trac.macports.org/ticket/39051>
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