docs: fix wording - Jackson is auto-configured by Spring Boot, not Spring

Agent-Logs-Url: https://github.com/ExpediaGroup/graphql-kotlin/sessions/8ef62519-266c-4590-89a2-8bca1e75f0e6

Co-authored-by: JordanJLopez <8593393+JordanJLopez@users.noreply.github.com>

Author: Copilot

website/docs/server/spring-server/spring-overview.mdx

@@ -68,7 +68,7 @@ graphql:
 
 ## Jackson 3 configuration
 
-With Spring Boot 4, Jackson 3 is auto-configured by Spring and `graphql-kotlin-spring-server` uses that configuration.
+With Spring Boot 4, Jackson 3 is auto-configured by Spring Boot and `graphql-kotlin-spring-server` uses that configuration.
 
 - Prefer configuring JSON through `spring.jackson.*` properties.
 - For programmatic customization, provide a `JsonMapperBuilderCustomizer` bean.