Prettify docs

Author: spawnia

docs/data-fetching.md

@@ -293,7 +293,7 @@ Where **$promiseAdapter** is an instance of:
   `GraphQL\Executor\Promise\Adapter\AmpPromiseAdapter`
 
 - For [Swoole](https://swoole.com/) or [OpenSwoole](https://openswoole.com/): <br>
-    You can use an external library: [Resonance](https://resonance.distantmagic.com/docs/features/graphql/standalone-promise-adapter.html)
+  You can use an external library: [Resonance](https://resonance.distantmagic.com/docs/features/graphql/standalone-promise-adapter.html)
 
 - Other platforms: write your own class implementing interface: <br>
   [`GraphQL\Executor\Promise\PromiseAdapter`](class-reference.md#graphqlexecutorpromisepromiseadapter).