[MacPorts] #25391: Update Guide to document support for bzr as fetch.type

[MacPorts]

#25391: Update Guide to document support for bzr as fetch.type
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 Reporter:  mike.mclean@…          |       Owner:  markd@…           
     Type:  defect                 |      Status:  new               
 Priority:  Low                    |   Milestone:                    
Component:  guide                  |     Version:  1.9.1             
 Keywords:                         |        Port:                    
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 Closed ticket http://trac.macports.org/ticket/23436 add bzr as a supported
 fetch.type.

 Update Section 5.3.3.1, Advanced Fetch Options of the guide
 (http://guide.macports.org/#reference.phases.fetch.advanced) to list bzr
 as a fetch.type.

 Create a 5.3.3.x section that lists the specifics for the bzr fetch.type.

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Ticket URL: <http://trac.macports.org/ticket/25391>
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