dead link fix

[techyang]

What is the purpose of the change

dead link fix

Brief changelog

XXXXX

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[ralf0131]

Hi, please don't update html files, they are generated automatically.

[ralf0131]

Hi, sorry but would you please take a look at the comments I left?

[techyang]

Hi, sorry but would you please take a look at the comments I left?
Ok,I got it. I will commit a pr later. thank you .

[code4wt]

issue #215 has a number of dead chains summarized, it is recommended to fix it at one time, otherwise you have to submit a lot of pull requests to complete the repair.

issue #215 中汇总了多条死链，建议一次性修复，不然要提交很多个 pull request 才能完成修复。

[techyang]

I'll fix one dead link and commit a pr , if it passed, I'll commit the others at one time.