[MacPorts] #56395: buildbot: Install asciidoctor in jobstoolsprefix for jobs-guide

[MacPorts]

#56395: buildbot: Install asciidoctor in jobstoolsprefix for jobs-guide
---------------------------+------------------------
 Reporter:  raimue         |      Owner:  ryandesign
     Type:  enhancement    |     Status:  assigned
 Priority:  Normal         |  Milestone:
Component:  buildbot/mpbb  |    Version:
 Keywords:                 |       Port:
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 Please install the port asciidoctor in `jobstoolsprefix` to allow
 generating the guide from the converted AsciiDoc sources.

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Ticket URL: <https://trac.macports.org/ticket/56395>
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