* Fix language in docs

Author: artembilan

src/reference/asciidoc/handler-advice.adoc

@@ -557,7 +557,7 @@ public Message<?> service(Message<?> message) {
 Starting with version 5.3, a `ReactiveRequestHandlerAdvice` can be used for request message handlers producing a `Mono` replies.
 A `BiFunction<Message<?>, Mono<?>, Publisher<?>>` has to be provided for this advice and it is called from the `Mono.transform()` operator on a reply produced by the intercepted `handleRequestMessage()` method implementation.
 Typically such a `Mono` customization is necessary when we would like to control network fluctuations via `timeout()`, `retry()` and similar support operators.
-For example when we can an HTTP request over WebFlux client, we could use bellow configuration to not wait for response more than 5 seconds:
+For example when we can an HTTP request over WebFlux client, we could use below configuration to not wait for response more than 5 seconds:
 
 ====
 [source, java]
@@ -567,8 +567,8 @@ For example when we can an HTTP request over WebFlux client, we could use bellow
 ----
 ====
 
-The `message` argument is a request message for such a message handler and can be used to determine a request-scope attributes.
-The `mono` argument is a result of this message handler `handleRequestMessage()` method implementation.
+The `message` argument is the request message for the message handler and can be used to determine request-scope attributes.
+The `mono` argument is the result of this message handler's `handleRequestMessage()` method implementation.
 A nested `Mono.transform()` can also be called from this function to apply, for example, a https://spring.io/projects/spring-cloud-circuitbreaker[Reactive Circuit Breaker].
 
 [[custom-advice]]