Update RPC document to reflect use of direct reply-to

Author: acogoluegnes

src/docs/asciidoc/usage.adoc

@@ -235,7 +235,7 @@ This behavior is hardcoded but it is possible to cancel it thanks to a reply pos
 
 The RPC client uses the following defaults:
 
-* it creates and waits for replies on an auto-delete, exclusive queue if no reply-to queue is set.
+* it uses https://www.rabbitmq.com/docs/direct-reply-to[direct reply-to] if available (RabbitMQ 4.2 or more) for replies if no reply-to queue is set (it falls back an auto-delete, exclusive queue if direct reply-to is not available)
 * it uses a string-based correlation ID generator, with a fixed random UUID prefix and a strictly monotonic increasing sequence suffix (`{UUID}-{sequence}`, e.g. `6f839461-6b19-47e1-80b3-6be10d899d85-42`).
 The prefix is different for each `RpcClient` instance and the suffix is incremented by one for each request.
 * it sets the _request_ https://docs.oasis-open.org/amqp/core/v1.0/os/amqp-core-messaging-v1.0-os.html#type-properties[`reply-to` property] to the reply-to queue address (defined by the user or created automatically, see above).

src/main/java/com/rabbitmq/client/amqp/Publisher.java

@@ -32,7 +32,7 @@ public interface Publisher extends AutoCloseable, Resource {
   /**
    * Create a message meant to be published by the publisher instance.
    *
-   * <p>Once published with the {@link #publish(Message, Callback)} the message instance should be
+   * <p>Once published with the {@link #publish(Message, Callback)} the message instance should
    * not be modified or even reused.
    *
    * @return a message
@@ -42,7 +42,7 @@ public interface Publisher extends AutoCloseable, Resource {
   /**
    * Create a message meant to be published by the publisher instance.
    *
-   * <p>Once published with the {@link #publish(Message, Callback)} the message instance should be
+   * <p>Once published with the {@link #publish(Message, Callback)} the message instance should
    * not be modified or even reused.
    *
    * @param body message body

src/main/java/com/rabbitmq/client/amqp/RpcClient.java

@@ -29,7 +29,7 @@ public interface RpcClient extends AutoCloseable {
   /**
    * Create a message meant to be published by the underlying publisher instance.
    *
-   * <p>Once published with the {@link #publish(Message)} the message instance should be not be
+   * <p>Once published with the {@link #publish(Message)} the message instance should not be
    * modified or even reused.
    *
    * @return a message
@@ -39,7 +39,7 @@ public interface RpcClient extends AutoCloseable {
   /**
    * Create a message meant to be published by the underlying publisher instance.
    *
-   * <p>Once published with the {@link #publish(Message)} the message instance should be not be
+   * <p>Once published with the {@link #publish(Message)} the message instance should not be
    * modified or even reused.
    *
    * @param body message body