adding a few illustrations for the doc

diff --git a/doc/diagrams/article-generation-example.sxd b/doc/diagrams/article-generation-example.sxd
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diff --git a/doc/diagrams/mir-architecture-mirrored.sxd b/doc/diagrams/mir-architecture-mirrored.sxd
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diff --git a/doc/diagrams/mir-architecture-singlehost.sxd b/doc/diagrams/mir-architecture-singlehost.sxd
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