Restore trailing newline (engine issue tracked in QuantEcon/action-translation#116)

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

Author: mmcky

lectures/mccall_fitted_vfi.md

@@ -873,4 +873,4 @@ plt.show()
 当$\gamma$更高时，失业带来的效用损失（即放弃的消费）会更加严重，这使得工人更愿意接受较低的工资，而不是继续搜寻。
 
 ```{solution-end}
-```
+```