Fix headers level (#33138)

Enriqe · web-flow · commit d1105664bb2f · 2021-03-09T13:10:46.000-05:00
Fix headers level
diff --git a/spec/amp-story-player.md b/spec/amp-story-player.md
@@ -639,7 +639,7 @@ player.addEventListener('storyNavigation', (event) => {
 })
 ```
 
-### noNextStory
+#### noNextStory
 
 Dispatched when there is no next story. Note that this will not be dispatched when using [Circular wrapping](#Circular-wrapping).
 
@@ -649,7 +649,7 @@ player.addEventListener('noNextStory', (event) => {
 });
 ```
 
-### noPreviousStory
+#### noPreviousStory
 
 Dispatched when there is no next story. Note that this will not be dispatched when using [Circular wrapping](#Circular-wrapping).
 
