Fix incorrect doc for java sdk

Java SDK already support creating timer. 

Signed-off-by: kaibocai <[email protected]>

daprdocs/content/en/developing-applications/building-blocks/workflow/workflow-patterns.md

@@ -496,9 +496,8 @@ public class MonitorWorkflow extends Workflow {
       }
 
       // Put the workflow to sleep until the determined time
-      // Note: ctx.createTimer() method is not supported in the Java SDK yet
       try {
-        TimeUnit.SECONDS.sleep(nextSleepInterval.getSeconds());
+        ctx.createTimer(nextSleepInterval);
       } catch (InterruptedException e) {
         throw new RuntimeException(e);
       }
@@ -745,4 +744,4 @@ External events don't have to be directly triggered by humans. They can also be
 - Try out the following examples: 
    - [Python](https://github.com/dapr/python-sdk/tree/master/examples/demo_workflow)
    - [.NET](https://github.com/dapr/dotnet-sdk/tree/master/examples/Workflow)
-   - [Java](https://github.com/dapr/java-sdk/tree/master/examples/src/main/java/io/dapr/examples/workflows)
+   - [Java](https://github.com/dapr/java-sdk/tree/master/examples/src/main/java/io/dapr/examples/workflows)