Fixed javadoc

Signed-off-by: Tomas Langer <tomas.langer@oracle.com>

fault-tolerance/src/main/java/io/helidon/faulttolerance/Async.java

@@ -34,14 +34,14 @@ import io.helidon.common.reactive.Single;
  *     Async async = Async.create();
  *
  *     // call a method with no parameters
- *     Single<String> result = async.invoke(this::slowSync);
+ *     Single<String> result = async.invoke(this::slowSync);
  *
  *     // call a method with parameters
- *     async.invoke(() -> processRequest(request))
+ *     async.invoke(() -> processRequest(request))
  *      .thenApply(response::send);
  *
  *     // use async to obtain a Multi (from a method returning List of strings)
- *     Multi<String> stringMulti = async.invoke(this::syncList)
+ *     Multi<String> stringMulti = async.invoke(this::syncList)
  *                 .flatMap(Multi::create);
  * </pre>
  */

fault-tolerance/src/main/java/io/helidon/faulttolerance/FaultTolerance.java

@@ -189,6 +189,7 @@ public final class FaultTolerance {
          * Add a handler to the list. This may be a custom handler or one of the predefined ones.
          *
          * @param ft fault tolerance handler to add
+         * @return updated builder instance
          */
         public abstract B add(FtHandler ft);
     }