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

[MacPorts]

#64329: guide and portfile man page: document missing keywords
--------------------------+---------------------
  Reporter:  mascguy      |      Owner:  mascguy
      Type:  enhancement  |     Status:  closed
  Priority:  Normal       |  Milestone:
 Component:  guide        |    Version:
Resolution:  fixed        |   Keywords:
      Port:               |
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Comment (by Christopher Nielsen <mascguy@…>):

 In [changeset:"ab01fd210d37b82a2182093f2d1e4b74c213a00f/macports-guide"
 ab01fd210d37b82a2182093f2d1e4b74c213a00f/macports-guide] (master):
 {{{
 #!ConfigurableCommitTicketReference repository="macports-guide"
 revision="ab01fd210d37b82a2182093f2d1e4b74c213a00f"
 startupitems: add startupitem.logfile.stderr

 See: https://trac.macports.org/ticket/64329
 See: https://trac.macports.org/ticket/67955
 See: https://github.com/macports/macports-base/pull/296
 }}}

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Ticket URL: <https://trac.macports.org/ticket/64329#comment:23>
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