Fix tree shake configuration

See https://quarkusio.zulipchat.com/#narrow/channel/187038-dev/topic/JAR.20tree.20shake/near/592642560

Author: geoand

_posts/2026-05-01-quarkus-3-35-released.adoc

@@ -36,7 +36,7 @@ For more information about the adjustments you need to make to your applications
 
 === JAR tree-shaking
 
-A new experimental `quarkus.package.jar.tree-shake` option enables build-time dependency tree-shaking.
+A new experimental `quarkus.package.jar.tree-shake.mode` option enables build-time dependency tree-shaking.
 When set to `classes`, Quarkus performs bytecode reachability analysis to identify and exclude unused classes from runtime dependencies, reducing application JAR size.
 
 The analysis traces references through supertypes, annotations, `ServiceLoader` entries, reflective class loading, and more.