[riot-notifications] [RIOT-OS/RIOT] README.md: fix doc link (#16786)

Francisco notifications at github.com
Mon Aug 30 08:57:42 CEST 2021

### Contribution description

I noticed the doc link badge is broken, this should fix it. 

### Testing procedure

Test the link in master, follow the link in this PR (or open the file in markdown and click on the badge).

You can view, comment on, or merge this pull request online at:


-- Commit Summary --

  * README.md: fix doc link

-- File Changes --

    M README.md (4)

-- Patch Links --


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