[MacPorts] #58426: Portfile instructions: unclear about global variable ${portbuildpath}

[MacPorts]

#58426: Portfile instructions: unclear about global variable ${portbuildpath}
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 Reporter:  frankliuao   |      Owner:  (none)
     Type:  enhancement  |     Status:  new
 Priority:  Normal       |  Milestone:
Component:  ports        |    Version:
 Keywords:               |       Port:
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 It directly affects the variable ${workpath} and ${destroot}, but it
 wasn't clearly given in guide.macports.org what the value is.

 Any one can add that on the website?

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Ticket URL: <https://trac.macports.org/ticket/58426>
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