Someone asks me how to check the archive of the mailing list.

I think we should add the link to the mailing list subscription guide.

In particular, change:

1. 
`docs/en-us/developers/contributor-guide/mailing-list-subscription-guide_dev.md`
2. 
`docs/zh-cn/developers/contributor-guide/mailing-list-subscription-guide_dev.md`

Add the following content:

How to view the archive of the mailing list: 
https://lists.apache.org/[email protected]

如何查看历史邮件:  https://lists.apache.org/[email protected]



[ Full content available at: 
https://github.com/apache/incubator-dubbo-website/issues/219 ]
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