[Doc] Add how to set the alarm mailbox in faq (#10401)

(cherry picked from commit b8d5e78994)

docs/docs/en/faq.md

@@ -23,7 +23,8 @@ Note：**Due to the large number of services, it is recommended that the single-
 
 ## Q: Which mailboxes does the system support?
 
-A: Support most mailboxes, qq, 163, 126, 139, outlook, aliyun, etc. are supported. Support TLS and SSL protocols, optionally configured in alert.properties
+A: Support most mailboxes, qq, 163, 126, 139, outlook, aliyun, etc. are supported. Support TLS and SSL protocols, these can be configured in the ui of dolphinscheduler:
+[How to setup email alarm](../en/guide/alert/email.md).
 
 ---
 

docs/docs/en/guide/alert/email.md

@@ -0,0 +1,6 @@
+# Email  
+If you need to use `Email` for alerting, create an alert instance in the alert instance management and select the Email plugin.
+The following shows the `Email` configuration example:
+![alert-email](../../../../img/alert/email-alter-setup1-en.png)
+![alert-email](../../../../img/alert/email-alter-setup2-en.png)
+![alert-email](../../../../img/alert/email-alter-setup3-en.png)

docs/docs/zh/faq.md

@@ -24,7 +24,8 @@ A：DolphinScheduler 由 5 个服务组成，MasterServer、WorkerServer、ApiSe
 
 ## Q：系统支持哪些邮箱？
 
-A：支持绝大多数邮箱，qq、163、126、139、outlook、aliyun 等皆支持。支持 **TLS 和 SSL** 协议，可以在 alert.properties 中选择性配置
+A：支持绝大多数邮箱，qq、163、126、139、outlook、aliyun 等皆支持。支持 **TLS 和 SSL** 协议，可以在dolphinscheduler的ui中进行配置：
+[如何配置邮箱告警](../zh/guide/alert/email.md)。
 
 ---
 

docs/docs/zh/guide/alert/email.md

@@ -0,0 +1,6 @@
+# Email
+如果需要使用`Email`进行告警，请在告警实例管理中创建告警实例，并选择Email插件。
+下面显示了 `Email` 配置示例：:
+![alert-email](../../../../img/alert/email-alter-setup1-en.png)
+![alert-email](../../../../img/alert/email-alter-setup2-en.png)
+![alert-email](../../../../img/alert/email-alter-setup3-en.png)