Fix broken code listing in OpenAPI Server Generation guide (#1599)

Author: andreiivanou3

guides/micronaut-openapi-generator-server/micronaut-openapi-generator-server.adoc

@@ -340,7 +340,7 @@ Micronaut OpenAPI has generated an interface for called `BooksApi` that we need
 
 Create a `BooksController.java` class with the following contents:
 
-source:controller/BooksController[tags=header|footer]
+source:controller/BooksController[tags=package|import|clazz|footer]
 
 === Implementing Controller Methods