[MacPorts] #40010: Add link to current port categories in MacPorts Guide 4.2

[MacPorts]

#40010: Add link to current port categories in MacPorts Guide 4.2
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 Reporter:  smithsp@…    |      Owner:  markd@…
     Type:  enhancement  |     Status:  new
 Priority:  Normal       |  Milestone:
Component:  guide        |    Version:
 Keywords:               |       Port:
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 In this section of the guide:
 http://guide.macports.org/chunked/development.creating-portfile.html
 under step 6, there should be a link to the current categories
 http://www.macports.org/ports.php

 Sorry if I didn't immediately see a way to update the Guide.

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Ticket URL: <https://trac.macports.org/ticket/40010>
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