cleanup, docs

site/doc/pages/array_merge.txt

@@ -22,7 +22,10 @@ For `DValue`, string keys from `b` overwrite keys from `a`. Numeric keys are app
 
 This helper is the closest UCE equivalent to PHP `array_merge()` for common request, config, and JSON-shaped data.
 
-## Related Concepts
-
-- PHP: `array_merge()`
-- JavaScript / Node.js: object spread, `Object.assign()`, or array concatenation depending on whether the data is map-like or list-like
+:example
+StringMap left;
+left["name"] = "Ada";
+StringMap right;
+right["role"] = "admin";
+StringMap merged = array_merge(left, right);
+print(merged["name"], " ", merged["role"], "\n");