[MacPorts] #56026: gsl: doc_python35 and doc_python36 variants are broken

[MacPorts]

#56026: gsl: doc_python35 and doc_python36 variants are broken
--------------------+--------------------------
 Reporter:  jmroot  |      Owner:  dtakahashi@…
     Type:  defect  |     Status:  new
 Priority:  Normal  |  Milestone:
Component:  ports   |    Version:
 Keywords:          |       Port:  gsl
--------------------+--------------------------
 These variants depend on nonexistent ports:
 {{{
 % port lint gsl +doc_python35
 --->  Verifying Portfile for gsl
 Error: Unknown dependency: py35-typing
 --->  1 errors and 0 warnings found.
 % port lint gsl +doc_python36
 --->  Verifying Portfile for gsl
 Error: Unknown dependency: py36-typing
 --->  1 errors and 0 warnings found.
 }}}
 I'm pretty sure these deps can simply be removed, as the typing module is
 included in the standard library of python 3.5+.

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Ticket URL: <https://trac.macports.org/ticket/56026>
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