Fix typo in WebMvc.fn document

Closes gh-35045

Signed-off-by: Yanming Zhou <[email protected]>

Author: quaff

framework-docs/modules/ROOT/pages/web/webmvc-functional.adoc

@@ -846,7 +846,7 @@ processing lifecycle and also (potentially) run side by side with annotated cont
 any are declared. It is also how functional endpoints are enabled by the Spring Boot Web
 starter.
 
-The following example shows a WebFlux Java configuration:
+The following example shows a WebMvc Java configuration:
 
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