Merge pull request #220066 from likebupt/update-schedule-20221201

fix typo in expression

Author: prmerger-automator[bot]

articles/machine-learning/how-to-schedule-pipeline-job.md

@@ -178,7 +178,7 @@ When define schedule, we support following expression that will be resolved to r
 
 | Expression | Description |Supported properties|
 |----------------|----------------|-------------|
-|`${{create_context.trigger_time}}`|The time when the schedule is triggered.|String type inputs of pipeline job|
+|`${{creation_context.trigger_time}}`|The time when the schedule is triggered.|String type inputs of pipeline job|
 |`${{name}}`|The name of job.|outputs.path of pipeline job|
 
 ## Manage schedule