DOC: update document describing relations between internal entities
Connections have left the stream interface. fdtab[] has been represented.
diff --git a/doc/internals/entities.svg b/doc/internals/entities.svg
index a059ba9..8911241 100644
--- a/doc/internals/entities.svg
+++ b/doc/internals/entities.svg
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stkctr</text>
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session</text>
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