Add a callout list to the Publisher listing in the Quarkus Data tutorial

The "Managed session" section has two listings, Publisher and Book, each
with <1> and <2> markers, but only one callout list, under Book. A 
callout
list attaches to the block directly above it, so the Publisher markers
had no entries. Give each listing its own list, as the tutorial already
does for the two classes in "Creating a Discount Service".

Part of #56509

Author: rolfedh

docs/src/main/asciidoc/quarkus-data-hibernate-getting-started.adoc

@@ -421,6 +421,8 @@ public class Publisher extends ManagedEntity { // <1>
     }
 }
 ----
+<1> `ManagedEntity` replaces `RecordEntity`. This tells Hibernate to track this entity in its persistence context.
+<2> The repository uses `ManagedRepository` instead of `RecordRepository`.
 
 [source,java]
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