Fix multiline YAML

Author: PowerKiKi

website/src/pages/docs/recipes/authentication.mdx

@@ -1,7 +1,7 @@
 ---
 description:
-Learn how to secure your Apollo Client using authentication headers or cookies. See examples of
-authenticating with JWT tokens and resetting the store on login/logout.
+  Learn how to secure your Apollo Client using authentication headers or cookies. See examples of
+  authenticating with JWT tokens and resetting the store on login/logout.
 ---
 
 import { Callout } from '@theguild/components';