Update app.py

Incorporated review comments

app.py

@@ -59,7 +59,13 @@ title = "SGD Penalties"
 
 with gr.Blocks(title=title) as demo:
     gr.Markdown(f"# {title}")
-
+    gr.Markdown(
+    """
+    ### The plot shows the contours of L1, L2 and Elastic Net regularizers.
+    ### The value of penalties is equal to 1 in all of them.
+    ### L2 regularizer is used for linear SVM models, L1 and elastic net brings sparsity in the models
+    ### SGDClassifier and SGDRegressor support all of the above.  
+    """)
 
     gr.Markdown(" **[Demo is based on sklearn docs](https://scikit-learn.org/stable/auto_examples/linear_model/plot_sgd_penalties.html#sphx-glr-auto-examples-linear-model-plot-sgd-penalties-py)**")