Fix typo in webflux-functional.adoc

Closes gh-24906

src/docs/asciidoc/web/webflux-functional.adoc

@@ -16,7 +16,7 @@ the same <<web-reactive.adoc#webflux-reactive-spring-web>> foundation.
 
 In WebFlux.fn, an HTTP request is handled with a `HandlerFunction`: a function that takes
 `ServerRequest` and returns a delayed `ServerResponse` (i.e. `Mono<ServerResponse>`).
-Both the request as the response object have immutable contracts that offer JDK 8-friendly
+Both the request and the response object have immutable contracts that offer JDK 8-friendly
 access to the HTTP request and response.
 `HandlerFunction` is the equivalent of the body of a `@RequestMapping` method in the
 annotation-based programming model.