Fix: Update built-in-types.mdx to reference correct type

The example source code for defineEasyType was referencing toggleType from the previous example. Changed it to use correct example.

Author: adihex

docs/pages/how-to/built-in-types.mdx

@@ -70,7 +70,7 @@ const booleanType = defineEasyType<boolean>({
     agree: true,
     disagree: false,
   }}
-  valueTypes={[toggleBoolType]}
+  valueTypes={[booleanType]}
 />
 ```
 [[Source Code]](https://github.com/TexteaInc/json-viewer/blob/main/docs/examples/JsonViewerToggleBoolean.tsx)