cleanup, docs

site/doc/pages/2_DValue_keys.txt

@@ -5,6 +5,7 @@ StringList DValue::keys() const
 return value : child keys for map/list values; empty for scalars
 
 :see
+>types
 0_DValue
 2_DValue_each
 0_StringList
@@ -12,6 +13,8 @@ return value : child keys for map/list values; empty for scalars
 :content
 Returns the keys produced by `each()`. Scalar values have no child key, so the result is empty. List-shaped values return their numeric keys as strings.
 
-```cpp
-StringList names = context.props["user"].keys();
-```
+:example
+DValue user;
+user["name"] = "Ada";
+user["role"] = "admin";
+print(join(user.keys().sort(), ","), "\n");