[OpenAFS-Doc] submission of architecture documents

[Steven Jenkins]

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There is an architecture documents for Demand Attach that I think
would be appropriate to place in, say, docs/arch (ie, instead of
classifying them by format, classify them by content).  Specifically,
I've attached a diagram of the state machine for Demand Attach, in Dot
format.

Does it make sense to put this document in doc/arch?  If not, what is
'the right' place?

Thanks,
Steven

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