Specs 中关于Domain-DomainName 字段没有说明

在文档中 https://github.com/alibaba/funcraft/blob/master/docs/specs/2018-04-03-zh-cn.md#%E5%B1%9E%E6%80%A7-2 没有看到 Dmaoin/DomainName 的说明，该字段还未发放么？

另外： 如果一个fc绑定了多个 DomainName 如何通过 `template` 声明:

```
Domain:
Type: 'Aliyun::Serverless::CustomDomain'
Properties:
DomainName: "serverA.test.com"
Protocol: HTTP
RouteConfig:
Routes:
"/*":
ServiceName: serverA
FunctionName: serverAFn1
"/api/*":
ServiceName: serverB
FunctionName: serverBFn1
```

如上如果需要增加一个 `serverB.test.com`的`DomainName`有方法么？

Read docs/specs/2018-04-03-zh-cn.md at the 属性-2 section and compare it with the CustomDomain template shown in the issue. Clarify whether Domain and DomainName are supported, and document how multiple domain names should be declared if supported; done when both questions are answered in the specification.

Written by the indexing model from the issue text.