[MacPorts] #64329: guide and portfile man page: document missing keywords

[MacPorts]

#64329: guide and portfile man page: document missing keywords
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  Reporter:  mascguy      |      Owner:  mascguy
      Type:  enhancement  |     Status:  assigned
  Priority:  Normal       |  Milestone:
 Component:  guide        |    Version:
Resolution:               |   Keywords:
      Port:               |
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Comment (by mascguy):

 PR created, to document `installs_libs` and `add_users` in the MacPorts
 Guide:

 [https://github.com/macports/macports-guide/pull/60 PR 60 - guide:
 keywords: document installs_libs, add_users]

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Ticket URL: <https://trac.macports.org/ticket/64329#comment:7>
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