[bug#64672] Forgot link

[Luis Henrique Gomes Higino]

Hi Guix,

forgot to add the link in previous email, it follows below. Also, 
I added a link to the cppreference website [1] as I also mentioned 
it on the message.

[0]: https://github.com/jeaye/stdman
[1]: https://en.cppreference.com/

Regards,
--
Luis H. Higino