cleanup, docs

site/doc/pages/1_ONCE.txt

@@ -27,23 +27,6 @@ When a request first enters a given file through `RENDER(Request& context)`, `CO
 
 ## Example
 
-```cpp
-ONCE(Request& context)
-{
-	context.call["card_defaults"]["tone"] = "info";
-}
 
-COMPONENT(Request& context)
-{
-	<>
-		<div class="card card-<?= context.call["card_defaults"]["tone"] ?>">
-			<?: component(":BODY", context.props, context) ?>
-		</div>
-	</>
-}
-```
-
-## Related Concepts
-
-- PHP: per-request bootstrap work before a template or partial first runs
-- JavaScript / Node.js: request-scoped lazy initialization before a route or component render
+:example
+print("ONCE is a unit directive; place it at top level in a .uce unit.\n");