Fix CDS link and clarify where and when to run the commands

Closes gh-41321

Author: mhalbritter

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

@@ -4,22 +4,30 @@
 
 
 [[packaging.efficient.unpacking]]
-== Unpacking the Executable JAR
+== Unpacking the Executable jar
 
 You can run your application using the executable jar, but loading the classes from nested jars has a small startup cost.
 Depending on the size of the jar, running the application from an exploded structure is faster and recommended in production.
 Certain PaaS implementations may also choose to extract archives before they run.
 For example, Cloud Foundry operates this way.
 
 Spring Boot supports extracting your application to a directory using different layouts.
-The default layout is the most efficient, and is xref:#deployment.efficient.cds[CDS friendly].
+The default layout is the most efficient, and is xref:reference:packaging/class-data-sharing.adoc[CDS friendly].
 
-In this layout, the libraries are extracted to a `lib/` folder, and the application JAR
+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.
 
+To unpack the executable jar, run this command:
+
 [source,shell]
 ----
 $ java -Djarmode=tools -jar my-app.jar extract
+----
+
+And then in production, you can run the extracted jar:
+
+[source,shell]
+----
 $ java -jar my-app/my-app.jar
 ----