Update paper.md

Author: Dheeraj791

paper.md

@@ -89,7 +89,7 @@ from muscle activity associated with fasciculations. It was designed to operate
 on a range of skeletal muscles and to be resistant to variations in ultrasound
 probe orientation, an important factor in clinical workflows.
 
-![High-level architecture](figures/hl_architecture.png)
+![High-level architecture](joss-paper/figures/hl_architecture.png)
 
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 Figure 1: High-level Architecture