[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:  (none)
     Type:  defect           |     Status:  new
 Priority:  Normal           |  Milestone:
Component:  ports            |    Version:  2.7.1
 Keywords:  matplotlib note  |       Port:  py-matplotlib
-----------------------------+---------------------------
 In the py-matplotlib/Portfile is a note that references
 <https://matplotlib.org/tutorials/introductory/usage.html#backends>.  The
 #backends tag in this URL no longer exists.  I wonder if this note should
 now point to <https://matplotlib.org/stable/users/explain/backends.html>.

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