BIND 10 #3040: PlantUML diagrams improvements

[BIND 10 Development]

#3040: PlantUML diagrams improvements
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            Reporter:  muks          |                        Owner:  muks
                Type:  defect        |                       Status:
            Priority:  medium        |  reviewing
           Component:                |                    Milestone:
  documentation                      |  Sprint-20130723
            Keywords:                |                   Resolution:
           Sensitive:  0             |                 CVSS Scoring:
         Sub-Project:  DNS           |              Defect Severity:  N/A
Estimated Difficulty:  0             |  Feature Depending on Ticket:
         Total Hours:  0.59          |          Add Hours to Ticket:  0
                                     |                    Internal?:  0
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Comment (by muks):

 The main problem was that the pre-branch class diagram used `->` arrow
 syntax instead of `-->`.

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Ticket URL: <https://bind10.isc.org/ticket/3040#comment:5>
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