cleanup, docs

site/doc/pages/3_C++ Preprocessor.txt

@@ -119,4 +119,8 @@ The page template can then render `context.call["fragments"]["head"]` inside `<h
 - If a `#load` include looks wrong, check the current file's directory, the configured `BIN_DIRECTORY`, and whether the loaded page already produced its own generated `.cpp`.
 
 :example
-print("C++ Preprocessor documents a UCE concept.\n");
+// The preprocessor lets you mix C++ logic with output. Code generates markup:
+StringList items = split("apples,pears,plums", ",");
+String html = "";
+items.each([&](String item) { html += "<li>" + item + "</li>"; });
+print(html, "\n");