another npm-to-yarn (#3312)

Author: Urigo

website/src/pages/tutorial/basic/03-graphql-server.mdx

@@ -52,8 +52,13 @@ function main() {
 main()
 ```
 
-Now, try to run your server again with `npm run dev` (or, `npm run start`), open your browser and
-navigate to `http://localhost:4000/graphql`.
+Now, try to run your server again with
+
+```sh npm2yarn
+npm run dev
+```
+
+open your browser and navigate to `http://localhost:4000/graphql`.
 
 Type in the following operation in the left editor section and press the `Play` button for executing
 the operation against the GraphQL server.
@@ -73,7 +78,7 @@ Unsurprisingly, the result looks like the following:
 Of course, it is also possible to send requests to the service without GraphiQL, e.g. by using
 `curl`.
 
-Run the following command within your terminal for executing the same query operation.
+In another terminal window, run the following command in order to execute the same query operation.
 
 ```sh
 curl -X POST http://localhost:4000/graphql -H "Content-type: application/json" --data-raw '{"query": "query { hello }"}'