Fix incorrect doc for java sdk

Java SDK already support creating timer. 

Signed-off-by: kaibocai <89094811+kaibocai@users.noreply.github.com>

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);
       }