BIND 10 #3022: fix guide about b10-cmdctl-usermgr

[BIND 10 Development]

#3022: fix guide about b10-cmdctl-usermgr
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                   Reporter:  jreed  |                 Owner:
                       Type:         |                Status:  new
  defect                             |             Milestone:  New Tasks
                   Priority:         |              Keywords:
  medium                             |             Sensitive:  0
                  Component:         |           Sub-Project:  Core
  documentation                      |  Estimated Difficulty:  0
               CVSS Scoring:         |           Total Hours:  0
            Defect Severity:  N/A    |
Feature Depending on Ticket:         |
        Add Hours to Ticket:  0      |
                  Internal?:  0      |
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 quick start says to run b10-cmdctl-usermgr  but that results in:
 Error: no command specified

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Ticket URL: <http://bind10.isc.org/ticket/3022>
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