easier links to user guide

as suggested by Steve

documentation/src/main/asciidoc/introduction/Advanced.adoc

@@ -404,7 +404,7 @@ Point event =
                 .getSingleResult();
 ----
 
-:matrix: https://docs.jboss.org/hibernate/orm/6.2/userguide/html_single/Hibernate_User_Guide.html#spatial-configuration-dialect-features
+:matrix: {userGuideBase}#spatial-configuration-dialect-features
 
 Here, `within()` is one of the functions for testing spatial relations defined by the OpenGIS specification.
 Other such functions include `touches()`, `intersects()`, `distance()`, `boundary()`, etc.

documentation/src/main/asciidoc/introduction/Configuration.adoc

@@ -77,7 +77,7 @@ Where `{version}` is the latest version of the JDBC driver for your databse.
 === Optional dependencies
 
 :slf4j: http://www.slf4j.org/
-:enhancer: https://docs.jboss.org/hibernate/orm/5.4/topical/html_single/bytecode/BytecodeEnhancement.html
+:enhancer: {versionDocBase}/topical/html_single/bytecode/BytecodeEnhancement.html
 :agroal: https://agroal.github.io
 :jackson: https://github.com/FasterXML/jackson
 :yasson: https://projects.eclipse.org/projects/ee4j.yasson
@@ -210,8 +210,8 @@ SessionFactory sessionFactory = new Configuration()
 The `Configuration` class has survived almost unchanged since the very earliest (pre-1.0) versions of Hibernate, and so it doesn't look particularly modern.
 On the other hand, it's very easy to use, and exposes some options that `persistence.xml` doesn't support.
 
-:native-bootstrap: https://docs.jboss.org/hibernate/orm/6.2/userguide/html_single/Hibernate_User_Guide.html#bootstrap-native
+:native-bootstrap: {userGuideBase}#bootstrap-native
-:boot: https://docs.jboss.org/hibernate/orm/6.2/javadocs/org/hibernate/boot/package-summary.html
+:boot: {versionDocBase}/javadocs/org/hibernate/boot/package-summary.html
 
 .Advanced configuration options
 ****

documentation/src/main/asciidoc/introduction/Hibernate_Introduction.adoc

@@ -3,6 +3,9 @@
 :icons: font
 :doctype: book
 :pdf-fontsdir: fonts
+:docsBase: https://docs.jboss.org/hibernate/orm
+:versionDocBase: {docsBase}/6.3
+:userGuideBase: {versionDocBase}/userguide/html_single/Hibernate_User_Guide.html
 
 = An introduction to Hibernate 6
 Gavin King and the Hibernate team

documentation/src/main/asciidoc/introduction/Interacting.adoc

@@ -381,7 +381,7 @@ It's not necessary to dirty-check on entity instance in read-only mode.
 [[queries]]
 === Queries
 
-:hql: https://docs.jboss.org/hibernate/orm/6.2/userguide/html_single/Hibernate_User_Guide.html#query-language
+:hql: {userGuideBase}#query-language
 
 Hibernate features three complementary ways to write queries:
 
@@ -392,7 +392,7 @@ Hibernate features three complementary ways to write queries:
 [[hql-queries]]
 === HQL queries
 
-:hql: https://docs.jboss.org/hibernate/orm/6.2/userguide/html_single/Hibernate_User_Guide.html#query-language
+:hql: {userGuideBase}#query-language
 
 A full discussion of the query language would require just as much text as the rest of this Introduction.
 Fortunately, HQL is already described in exhaustive (and exhausting) detail in the {hql}[User Guide].
@@ -570,7 +570,7 @@ query.select(book).where(where)
 ----
 
 :generator: https://hibernate.org/orm/tooling/
-:generator-guide: https://docs.jboss.org/hibernate/orm/6.2/userguide/html_single/Hibernate_User_Guide.html#tooling-modelgen
+:generator-guide: {userGuideBase}#tooling-modelgen
 
 Here, the classes `Book_` and `Author_` are classes generated by Hibernate's {generator}[JPA Metamodel Generator], which is documented in the {generator-guide}[User Guide].
 

documentation/src/main/asciidoc/introduction/Preface.adoc

@@ -1,7 +1,7 @@
 [[preface]]
 == Preface
 
-:user-guide: https://docs.jboss.org/hibernate/orm/6.2/userguide/html_single/Hibernate_User_Guide.html
+:user-guide: {userGuideBase}
 
 Hibernate 6 is a major redesign of the world's most popular and feature-rich ORM solution.
 The redesign has touched almost every subsystem of Hibernate, including the APIs, mapping annotations, and the query language.

documentation/src/main/asciidoc/introduction/Tuning.adoc

@@ -97,7 +97,7 @@ Even better than DML statement batching is the use of HQL `update` or `delete` q
 [[association-fetching]]
 === Association fetching
 
-:association-fetching: https://docs.jboss.org/hibernate/orm/6.2/userguide/html_single/Hibernate_User_Guide.html#fetching
+:association-fetching: {userGuideBase}#fetching
 
 Achieving high performance in ORM means minimizing the number of round
 trips to the database. This goal should be uppermost in your mind
@@ -165,7 +165,7 @@ You can find much more information about association fetching in the
 [[second-level-cache]]
 === The second-level cache
 
-:second-level-cache: https://docs.jboss.org/hibernate/orm/6.2/userguide/html_single/Hibernate_User_Guide.html#caching
+:second-level-cache: {userGuideBase}#caching
 
 A classic way to reduce the number of accesses to the database is to use a second-level cache, allowing  data cached in memory to be shared between sessions.