Remove outdated reference to Jackson Kotlin Module

See gh-48525

Signed-off-by: Dmitry Sulman <[email protected]>

Author: dmitrysulman

spring-boot-project/spring-boot-docs/src/docs/antora/modules/reference/pages/features/kotlin.adoc

@@ -23,7 +23,6 @@ Since https://discuss.kotlinlang.org/t/classes-final-by-default/166[Kotlin class
 
 https://github.com/FasterXML/jackson-module-kotlin[Jackson's Kotlin module] is required for serializing / deserializing JSON data in Kotlin.
 It is automatically registered when found on the classpath.
-A warning message is logged if Jackson and Kotlin are present but the Jackson Kotlin module is not.
 
 TIP: These dependencies and plugins are provided by default if one bootstraps a Kotlin project on https://start.spring.io/#!language=kotlin[start.spring.io].