improve javadoc fo @Subselect

hibernate-core/src/main/java/org/hibernate/annotations/Subselect.java

@@ -14,6 +14,9 @@ import static java.lang.annotation.RetentionPolicy.RUNTIME;
 
 /**
  * Maps an immutable and read-only entity to a given SQL {@code select} expression.
+ * <p>
+ * This is an alternative to defining a database view and mapping the entity to
+ * the view using the {@link jakarta.persistence.Table @Table} annotation.
  *
  * @see Synchronize
  *