internals: refactor wire protocol documentation
Upcoming work will introduce a new version of the HTTP and SSH
transports. The differences will be significant enough to consider
them new transports. So, we now attach a version number to each
transport.
In addition, having the handshake documented after the transport
and in a single shared section made it harder to follow the flow
of the connection. The handshake documentation is now moved to the
protocol section it describes. We now have a generic section about
the purpose of the handshake, which was rewritten significantly.
Differential Revision: https://phab.mercurial-scm.org/D2060
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