docs: add description to modelina docs

pages/tools/modelina.js

@@ -189,7 +189,7 @@ export default function ModelinaPlaygroundPage() {
  const [error, setError] = useState();
  const tryItOutRef = useRef(null);
 
- const description = 'Sometimes you just want to generate data models for your payload.';
+ const description = 'Sometimes you just want to generate data models for your payload. Modelina is a library for generating data models based on inputs such as AsyncAPI, OpenAPI, or JSON Schema documents.';
  const image = '/img/social/modelina-card.jpg';
 
  const tabs = (