Correct not compiling example code in Data Access docs

The EntityManager interface does not implement AutoCloseable until
JPA 3.1.

This commit therefore partially reverts 189e1af so that the
example code compiles with the supported JPA version.

See gh-22269
Closes gh-27886

Author: jjank

src/docs/asciidoc/data-access.adoc

@@ -2444,10 +2444,10 @@ the `TransactionOperator` resembles the next example:
 		}
 
 		public Mono<Object> someServiceMethod() {
-			
+
 			// the code in this method runs in a transactional context
-			
-            Mono<Object> update = updateOperation1();
+
+			Mono<Object> update = updateOperation1();
 
 			return update.then(resultOfUpdateOperation2).as(transactionalOperator::transactional);
 		}
@@ -8221,11 +8221,17 @@ that uses the `@PersistenceUnit` annotation:
 		}
 
 		public Collection loadProductsByCategory(String category) {
-			try (EntityManager em = this.emf.createEntityManager()) {
+			EntityManager em = this.emf.createEntityManager();
+			try {
 				Query query = em.createQuery("from Product as p where p.category = ?1");
 				query.setParameter(1, category);
 				return query.getResultList();
 			}
+			finally {
+				if (em != null) {
+					em.close();
+				}
+			}
 		}
 	}
 ----