cleanup, docs

site/doc/pages/0_StringMap.txt

@@ -28,7 +28,7 @@ Because it uses `std::map`, `map["key"]` will create an empty entry when that ke
 
 Helpers such as `parse_query()` and `encode_query()` convert between query strings and `StringMap` values.
 
-## Related Concepts
-
-- PHP: associative arrays keyed by string, especially request bags like `$_GET` and `$_SERVER`
-- JavaScript / Node.js: plain objects, dictionaries, `Map`, and header or query objects in web frameworks
+:example
+StringMap params;
+params["page"] = "docs";
+print(params["page"], "\n");