Update app.py

Fixed major typo

app.py

@@ -136,7 +136,7 @@ The model is trained using the scikit-learn library, which provides a range of t
             outputs=gr.Plot(),
         )
 
-    with gr.Tab("Trian Your Model"):
+    with gr.Tab("Train Your Model"):
         gr.Markdown("# Play with the parameters to see how the model changes")
 
         gr.Markdown("## Solver and penalty")