added checked toggle switch example

Author: olivierauverlot

examples/official-site/sqlpage/migrations/01_documentation.sql

@@ -361,7 +361,7 @@ When loading the page, the value for `:username` will be `NULL` if no value has
  ('form','A toggle switch in an HTML form is a user interface element that allows users to switch between two states, typically "on" and "off." It visually resembles a physical switch and is often used for settings or options that can be enabled or disabled.',
     json('[{"component":"form"}, '||
     '{"type": "switch", "label": "Dark theme", "description": "Enable dark theme"},' ||
-    '{"type": "switch", "label": "A required toggle switch", "required": true},' ||
+    '{"type": "switch", "label": "A required toggle switch", "required": true,"checked": true},' ||
     '{"type": "switch", "label": "A disabled toggle switch", "disabled": true},' ||
     ']')),