Clarify docker run commands and link to admin manual section I had documented how to run a demo docker container and added a footnote on how to change it to run with the hub.docker.com container. It didn't really save any space and prevented cut/paste. Replace with two examples that can be properly cut and pasted. Link to the section in the admin guide that describes how to initialize a tracker unattended without disclosing the password on command line or in environment. Also fix a typo.

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