use right decompiler prop name in docs

docs/src/main/asciidoc/writing-extensions.adoc

@@ -2252,7 +2252,7 @@ The only particular aspect of writing Quarkus extensions in Eclipse is that APT
 Quarkus generates a lot of classes during the build phase and in many cases also transforms existing classes.
 It is often extremely useful to see the generated bytecode and transformed classes during the development of an extension.
 
-If you set the `quarkus.package.decompiler.enabled` property to `true` then Quarkus will download and invoke the https://github.com/Vineflower/vineflower[Vineflower decompiler] and dump the result in the `decompiled` directory of the build tool output (`target/decompiled` for Maven for example).
+If you set the `quarkus.package.jar.decompiler.enabled` property to `true` then Quarkus will download and invoke the https://github.com/Vineflower/vineflower[Vineflower decompiler] and dump the result in the `decompiled` directory of the build tool output (`target/decompiled` for Maven for example).
 
 NOTE: This property only works during a normal production build (i.e. not for dev mode/tests) and when `fast-jar` packaging type is used (the default behavior).