chore: improve wording

Author: kamilmysliwiec

content/openapi/introduction.md

@@ -37,7 +37,7 @@ async function bootstrap() {
 bootstrap();
 ```
 
-> info **Hint** The factory around `SwaggerModule#createDocument()` is only used to create the document when you actually request Swagger, saving some initialization time and is a serializable object conforming to [OpenAPI Document](https://swagger.io/specification/#openapi-document). Instead of hosting it via HTTP, you could also save it as a JSON/YAML file, and consume it in different ways.
+> info **Hint** The factory method `SwaggerModule#createDocument()` is used specifically to generate the Swagger document when you request it. This approach helps save some initialization time, and the resulting document is a serializable object that conforms to the [OpenAPI Document](https://swagger.io/specification/#openapi-document) specification. Instead of serving the document over HTTP, you can also save it as a JSON or YAML file and use it in various ways.
 
 The `DocumentBuilder` helps to structure a base document that conforms to the OpenAPI Specification. It provides several methods that allow setting such properties as title, description, version, etc. In order to create a full document (with all HTTP routes defined) we use the `createDocument()` method of the `SwaggerModule` class. This method takes two arguments, an application instance and a Swagger options object. Alternatively, we can provide a third argument, which should be of type `SwaggerDocumentOptions`. More on this in the [Document options section](/openapi/introduction#document-options).