Merge pull request #3185 from thomaschaaf/patch-1

docs(schedule): add waitForCompletion

Author: kamilmysliwiec

content/techniques/task-scheduling.md

@@ -144,6 +144,12 @@ Also, you can supply additional options as the second parameter to the `@Cron()`
         This allows you to specify the offset of your timezone rather than using the <code>timeZone</code> param.
       </td>
     </tr>
+    <tr>
+      <td><code>waitForCompletion</code></td>
+      <td>
+        If <code>true</code>, no additional instances of the cron job will run until the current onTick callback has been completed. Any new scheduled executions that occur while the current cron job is running will be skipped entirely.
+      </td>
+    </tr>
     <tr>
       <td><code>disabled</code></td>
       <td>