BIND 10 #1732: document in-memory data source use in the guide

[BIND 10 Development]

#1732: document in-memory data source use in the guide
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                   Reporter:  jreed  |                 Owner:  UnAssigned
                       Type:  task   |                Status:  assigned
                   Priority:         |             Milestone:
  medium                             |  Sprint-20120403
                  Component:         |            Resolution:
  documentation                      |             Sensitive:  0
                   Keywords:         |           Sub-Project:  DNS
            Defect Severity:  N/A    |  Estimated Difficulty:  3
Feature Depending on Ticket:         |           Total Hours:  0
        Add Hours to Ticket:  0      |
                  Internal?:  0      |
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Comment (by jinmei):

 I've released this tickets as Jeremy said he would work on this.

 I'm attaching some initial updates of mine in the form of diff JYI.

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Ticket URL: <http://bind10.isc.org/ticket/1732#comment:6>
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