Update comments in template apps (#2370)

reflex/.templates/apps/blank/code/blank.py

@@ -39,6 +39,6 @@ def index() -> rx.Component:
     )
 
 
-# Add state and page to the app.
+# Create app instance and add index page.
 app = rx.App()
 app.add_page(index)

reflex/.templates/apps/demo/code/demo.py

@@ -118,5 +118,5 @@ def chatapp() -> rx.Component:
     return chatapp_page()
 
 
-# Add state and page to the app.
+# Create the app.
 app = rx.App(style=base_style)