docs: add disabled+active toggleswitch example

Author: Ricardo Lüders

app/docs/components/forms/forms.mdx

@@ -456,6 +456,7 @@ Use the `<ToggleSwitch>` component to ask users to enable or disable an option s
     <ToggleSwitch checked={props.switch1} label="Toggle me" onChange={props.setSwitch1} />
     <ToggleSwitch checked={props.switch2} label="Toggle me (checked)" onChange={props.setSwitch2} />
     <ToggleSwitch checked={false} disabled label="Toggle me (disabled)" onChange={() => undefined} />
+    <ToggleSwitch checked={true} disabled label="Toggle me (disabled)" onChange={() => undefined} />
     <ToggleSwitch checked={props.switch3} onChange={props.setSwitch3} />
   </div>
 </CodePreview>