Update certbot.rst

[drmad]

Add $uri to share for Unit version >1.26, as noted in https://unit.nginx.org/configuration/#static-files

Perhaps more aclaration is needed about the matter.

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[ac000]

Hi @drmad

Could you make a minor tweak to the commit message and just stick the URL on the next line and enclose it in <>'s, that way we keep our commit messages to within a ~72 character line limit.

Also perhaps something like

Add $uri to the share setting in certbot.rst

would be a more descriptive subject.

Thanks!