Fix display of warning

docs/installation-and-operations/configuration/README.md

@@ -175,8 +175,6 @@ OPENPROJECT_SEED_ADMIN_USER_MAIL="[email protected]" # Email attribute to assign
 
 Optionally, you can also lock the admin user that gets created right away. This is useful when you have an LDAP or SSO integration set up and you want to prevent the admin user from logging in.
 
-```shell 
-
 > [!WARNING]
 > With the admin user seeding disabled, you need to have an LDAP or SSO integration set up through environment variables.
 > Otherwise, you will not be able to retain access to the system.