README: Headlines are now outside of ```openapi

Simran-B · Simran-B · commit 5ec5d942a830 · 2023-10-11T12:23:19.000+02:00
diff --git a/README.md b/README.md
@@ -343,8 +343,6 @@ code blocks but the syntax then needs to be like this:
 
 ````yaml
 ```openapi
-### Headline
-
 paths:
   /_api/endpoint:
     post:
