fixed 657895fd from https://gitee.com/ningningW/docs-yuanma/pulls/18835

update zh-cn/application-dev/reference/apis/js-apis-reminderAgentManager.md.
Signed-off-by: Nningning <3248127340@qq.com>

zh-cn/application-dev/reference/apis/js-apis-reminderAgentManager.md

@@ -170,7 +170,7 @@ cancelReminder(reminderId: number): Promise\<void>
 
 | 类型 | 说明 |
 | -------- | -------- |
-| PPromise\<void>	 | Promise类型异步回调。 |
+| Promise\<void>	 | Promise类型异步回调。 |
 
 **错误码：**