Fix async cell

code_examples/1_basics/6_training_programs.py

@@ -270,7 +270,7 @@ def _(synalinks):
 
 
 @app.cell
-def _(
+async def _(
         checkpoint_filepath,
         train,
         x_test,
@@ -291,7 +291,7 @@ def _(
     synalinks.utils.plot_metrics(metrics)
 
 @app.cell(hide_code=True)
-async def _(mo):
+def _(mo):
     mo.md(
         r"""
         ## Conclusion