Update my_app.aiconfig.json

Use 'notebook' instead of 'workbook' in title

my_app.aiconfig.json

@@ -1,5 +1,5 @@
 {
-  "name": "Gradio Workbook Quickstart",
+  "name": "Gradio Notebook Quickstart",
   "schema_version": "latest",
   "metadata": {
     "parameters": {},
@@ -62,4 +62,4 @@
       ]
     }
   ]
-}
+}