Update app.py

app.py

@@ -45,7 +45,8 @@ def sample_classify_text(text_content):
         request={
             "document": document,
             "classification_model_options": {
-                "v2_model": {"content_categories_version": content_categories_version}
+                "v1_model": {"content_categories_version": content_categories_version}
+                # choose between v1_model or v2_model, https://cloud.google.com/natural-language/docs/reference/rest/v1/ClassificationModelOptions
             },
         }
     )