Remove notes about WebTestClient type inference issue in Kotlin

Since gh-28144 was resolved in Spring Framework 6.0, these notes are no
longer relevant.

Author: sbrannen

framework-docs/modules/ROOT/pages/languages/kotlin/spring-projects-in.adoc

@@ -383,15 +383,3 @@ class SpecificationLikeTests {
 ----
 
 
-[[kotlin-webtestclient-issue]]
-=== `WebTestClient` Type Inference Issue in Kotlin
-
-Due to a https://youtrack.jetbrains.com/issue/KT-5464[type inference issue], you must
-use the Kotlin `expectBody` extension (such as `.expectBody<String>().isEqualTo("toys")`),
-since it provides a workaround for the Kotlin issue with the Java API.
-
-See also the related https://jira.spring.io/browse/SPR-16057[SPR-16057] issue.
-
-
-
-

framework-docs/modules/ROOT/pages/testing/webtestclient.adoc

@@ -7,9 +7,6 @@ but exposes a testing facade for verifying responses. `WebTestClient` can be use
 perform end-to-end HTTP tests. It can also be used to test Spring MVC and Spring WebFlux
 applications without a running server via mock server request and response objects.
 
-TIP: Kotlin users: See xref:languages/kotlin/spring-projects-in.adoc#kotlin-webtestclient-issue[this section]
-related to use of the `WebTestClient`.
-