[MacPorts] #64225: py39-matplotlib @3.5.1_0+cairo+webagg: link in note about backend needs updating

[MacPorts]

#64225: py39-matplotlib @3.5.1_0+cairo+webagg: link in note about backend needs
updating
----------------------------+------------------------
  Reporter:  bal-agates     |      Owner:  reneeotten
      Type:  defect         |     Status:  assigned
  Priority:  Normal         |  Milestone:
 Component:  ports          |    Version:  2.7.1
Resolution:                 |   Keywords:
      Port:  py-matplotlib  |
----------------------------+------------------------
Changes (by ryandesign):

 * owner:  (none) => reneeotten
 * status:  new => assigned
 * keywords:  matplotlib note =>


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Ticket URL: <https://trac.macports.org/ticket/64225#comment:1>
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