add voice template

Author: niuweili

en/on-call/configuration/templates.mdx

@@ -614,6 +614,13 @@ Duration: {{ago .StartTime}}
 <Tab title="SMS">
 **Default Template**:
 
+```go
+You have a pending incident: {{toHtml .Title}}, Channel: {{.ChannelName}}, Severity: {{.IncidentSeverity}}{{if gt .AlertCnt 1}}, {{.AlertCnt}} alerts grouped{{end}}
+```
+</Tab>
+<Tab title="Voice">
+**Default Template**:
+
 ```go
 You have a pending incident: {{toHtml .Title}}, Channel: {{.ChannelName}}, Severity: {{.IncidentSeverity}}{{if gt .AlertCnt 1}}, {{.AlertCnt}} alerts grouped{{end}}
 ```

zh/on-call/configuration/templates.mdx

@@ -641,6 +641,13 @@ keywords: ["通知模板", "模板配置", "消息格式", "模板变量", "通
 <Tab title="短信">
 **默认模板**：
 
+```go
+您有故障待处理：{{toHtml .Title}}，协作空间：{{.ChannelName}}，等级：{{.IncidentSeverity}}{{if gt .AlertCnt 1}}，共聚合{{.AlertCnt}}条告警{{end}}
+```
+</Tab>
+<Tab title="语音">
+**默认模板**：
+
 ```go
 您有故障待处理：{{toHtml .Title}}，协作空间：{{.ChannelName}}，等级：{{.IncidentSeverity}}{{if gt .AlertCnt 1}}，共聚合{{.AlertCnt}}条告警{{end}}
 ```