Fix Java pause/resume docs example to finish with resume

[seglo]

Reported by @mckeeh3

https://doc.akka.io/docs/akka-projection/current/management.html?_ga=2.226035482.1601428721.1620908416-167537786.1584038307#pause-and-resume

ProjectionId projectionId = ProjectionId.of("shopping-carts", "carts-1");
ProjectionManagement mgmt = ProjectionManagement.get(system);
CompletionStage<Done> pauseDone = mgmt.pause(projectionId);
CompletionStage<Done> migrationDone = pauseDone.thenCompose(notUsed -> someDataMigration());
CompletionStage<Done> resumeDone = migrationDone.thenCompose(notUsed -> mgmt.pause(projectionId));

Last line should be

CompletionStage<Done> resumeDone = migrationDone.thenCompose(notUsed -> mgmt.resume(projectionId));