!htp #17965 more consistent and 22-ified javadsl handleWith

akka-docs-dev/rst/java/code/docs/http/javadsl/PathDirectiveExampleTest.java

@@ -44,7 +44,7 @@ public class PathDirectiveExampleTest extends JUnitRouteTest {
         Handler1<Integer> completeWithUserId =
             new Handler1<Integer>() {
                 @Override
-                public RouteResult handle(RequestContext ctx, Integer userId) {
+                public RouteResult apply(RequestContext ctx, Integer userId) {
                     return ctx.complete("Hello user " + userId);
                 }
             };