[MacPorts] #57890: asciidoc: Update homepage

[MacPorts]

#57890: asciidoc: Update homepage
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 Reporter:  sharris40  |      Owner:  neverpanic
     Type:  defect     |     Status:  assigned
 Priority:  Low        |  Milestone:
Component:  ports      |    Version:
 Keywords:             |       Port:  asciidoc
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 New homepage is [http://asciidoc.org/].

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Ticket URL: <https://trac.macports.org/ticket/57890>
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