Update docs.

Author: yang-xiaodong

docs/content/user-guide/en/cap/configuration.md

@@ -85,7 +85,7 @@ During the message sending process if consumption method fails, CAP will try to
     By default if failure occurs on send or consume, retry will start after **4 minutes** in order to avoid possible problems caused by setting message state delays.    
     Failures in the process of sending and consuming messages will be retried 3 times immediately, and will be retried polling after 3 times, at which point the FailedRetryInterval configuration will take effect.
 
-### CollectorCleaningInterval
+#### CollectorCleaningInterval
 
 > Default: 300 sec
 

docs/content/user-guide/zh/cap/configuration.md

@@ -92,7 +92,7 @@ services.AddCap(config =>
 
 消费者线程并行处理消息的线程数，当这个值大于1时，将不能保证消息执行的顺序。
 
-### CollectorCleaningInterval
+#### CollectorCleaningInterval
 
 默认值：300 秒