Document CDS support

Closes gh-40061

spring-boot-project/spring-boot-docs/src/docs/antora/modules/reference/pages/deployment/efficient.adoc

@@ -6,30 +6,27 @@
 [[deployment.efficient.unpacking]]
 == Unpacking the Executable JAR
 
-If you are running your application from a container, you can use an executable jar, but it is also often an advantage to explode it and run it in a different way.
-Certain PaaS implementations may also choose to unpack archives before they run.
+If you are running your application, you can use an executable jar, but it is also often an advantage to extract it and run it in a different way.
+Certain PaaS implementations may also choose to extract archives before they run.
 For example, Cloud Foundry operates this way.
-One way to run an unpacked archive is by starting the appropriate launcher, as follows:
 
-[source,shell]
-----
-$ jar -xf myapp.jar
-$ java org.springframework.boot.loader.launch.JarLauncher
-----
+With the help of the jarmode, you can extract the jar to different layouts.
+The most efficient layout is a CDS (class data sharing) friendly layout.
+This layout is used by default.
 
-This is actually slightly faster on startup (depending on the size of the jar) than running from an unexploded archive.
-After startup, you should not expect any differences.
-
-Once you have unpacked the jar file, you can also get an extra boost to startup time by running the app with its "natural" main method instead of the `JarLauncher`. For example:
+In this layout, the libraries are extracted to a `lib/` folder, and the application JAR
+contains the application classes and a manifest which references the libraries in the `lib/` folder.
 
 [source,shell]
 ----
-$ jar -xf myapp.jar
-$ java -cp "BOOT-INF/classes:BOOT-INF/lib/*" com.example.MyApplication
+$ java -Djarmode=tools -jar my-app.jar extract
+$ java -jar my-app/my-app.jar
 ----
 
-NOTE: Using the `JarLauncher` over the application's main method has the added benefit of a predictable classpath order.
-The jar contains a `classpath.idx` file which is used by the `JarLauncher` when constructing the classpath.
+This is actually faster on startup (depending on the size of the jar) than running from an unexploded archive.
+After startup, you should not expect any differences.
+
+TIP: Run `java -Djarmode=tools -jar my-app.jar help extract` to see all possible options.