[Buildbot] #2993: Better document the multi-container Docker solution

[Buildbot trac]

#2993: Better document the multi-container Docker solution
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Reporter:  Ben     |       Owner:
    Type:  task    |      Status:  new
Priority:  minor   |   Milestone:  undecided
 Version:  master  |  Resolution:
Keywords:  docker  |
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Description changed by sa2ajj:

Old description:

> We now have under `contrib/Dockerfile`s two Docker files that demonstrate
> how to run buildbot under separate Docker environment.
>
> They should be better mentioned in the  manual.

New description:

 We now have under `contrib/Dockerfiles` two Docker files that demonstrate
 how to run buildbot under separate Docker environment.

 They should be better mentioned in the  manual.

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Ticket URL: <http://trac.buildbot.net/ticket/2993#comment:2>
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