Fix multline YAML

Author: PowerKiKi

website/src/pages/docs/development-and-testing/testing.mdx

@@ -1,8 +1,8 @@
 ---
 description:
-Learn how to test apollo-angular code using Jest with ApolloTestingModule. It allows for easy
-mocking of calls to the GraphQL endpoint, so tests can run in isolation and produce consistent
-results.
+  Learn how to test apollo-angular code using Jest with ApolloTestingModule. It allows for easy
+  mocking of calls to the GraphQL endpoint, so tests can run in isolation and produce consistent
+  results.
 ---
 
 import { Callout } from '@theguild/components';