Fix state transition diagram

This now represents the implemented model

Signed-off-by: Ryan Everett <ryan.everett@arm.com>
diff --git a/docs/architecture/psa-thread-safety/key-slot-state-transitions.png b/docs/architecture/psa-thread-safety/key-slot-state-transitions.png
index 34cc79b..1b50e73 100644
--- a/docs/architecture/psa-thread-safety/key-slot-state-transitions.png
+++ b/docs/architecture/psa-thread-safety/key-slot-state-transitions.png
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