BIND 10 #2953: document for bindctl how to query individual Auth stats

[BIND 10 Development]

#2953: document for bindctl how to query individual Auth stats
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            Reporter:  jreed         |                        Owner:
                Type:  defect        |                       Status:  new
            Priority:  medium        |                    Milestone:  New
           Component:  statistics    |  Tasks
            Keywords:                |                   Resolution:
           Sensitive:  0             |                 CVSS Scoring:
         Sub-Project:  Core          |              Defect Severity:  N/A
Estimated Difficulty:  0             |  Feature Depending on Ticket:
         Total Hours:  0             |          Add Hours to Ticket:  0
                                     |                    Internal?:  0
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Comment (by vorner):

 Does bindctl still take the named arguments, or was it switched to
 positional and the help not updated?

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Ticket URL: <https://bind10.isc.org/ticket/2953#comment:1>
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