Disallow leading whitespace before delimiter

cypress/integration/rendering/classDiagram-v2.spec.js

@@ -500,11 +500,11 @@ describe('Class diagram V2', () => {
   it('1433: should render a simple class with a title', () => {
     imgSnapshotTest(
       `---
-       title: simple class diagram
-       ---
-       classDiagram-v2
-       class Class10
-      `,
+title: simple class diagram
+---
+classDiagram-v2
+class Class10
+`,
       {}
     );
   });