docs: vhost-user: Define memory region separately

The same layout is defined twice, once in "single memory region
description" and then in "memory regions description".

Separate out details of memory region from these two and reuse the same
definition later on.

While at it, also rename "memory regions description" to "multiple
memory regions description", to avoid potential confusion around similar
names. And define single region before multiple ones.

This is just a documentation optimization, the protocol remains the same.

Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>
Message-Id: <7c3718e5eb99178b22696682ae73aca6df1899c7.1678351495.git.viresh.kumar@linaro.org>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
Reviewed-by: Alex Bennée <alex.bennee@linaro.org>

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