Improve Javadoc for HandlerAdapter and HandlerMapping

spring-web-reactive/src/main/java/org/springframework/web/reactive/HandlerAdapter.java

@@ -52,7 +52,7 @@ public interface HandlerAdapter {
 	 * @param handler handler to use. This object must have previously been passed
 	 * to the {@code supports} method of this interface, which must have
 	 * returned {@code true}.
-	 * @return An {@link HandlerResult} instance
+	 * @return A {@link Publisher} object that produces a single {@link HandlerResult} element
 	 */
 	Publisher<HandlerResult> handle(ReactiveServerHttpRequest request,
 			ReactiveServerHttpResponse response, Object handler);

spring-web-reactive/src/main/java/org/springframework/web/reactive/HandlerMapping.java

@@ -21,10 +21,19 @@ import org.reactivestreams.Publisher;
 import org.springframework.http.server.ReactiveServerHttpRequest;
 
 /**
+ * Interface to be implemented by objects that define a mapping between
+ * requests and handler objects.
+ *
  * @author Rossen Stoyanchev
+ * @author Sebastien Deleuze
  */
 public interface HandlerMapping {
 
+	/**
+	 * Return a handler for this request.
+	 * @param request current HTTP request
+	 * @return A {@link Publisher} object that produces a single handler element
+	 */
 	Publisher<Object> getHandler(ReactiveServerHttpRequest request);
 
 }