Remove mentions of documentation-reviewers team

See also https://github.com/NixOS/nix.dev/pull/978

CONTRIBUTING.md

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 To get more information about how to review specific parts of Nixpkgs, refer to the documents linked to in the [overview section][overview].
 
-If a pull request contains documentation changes that might require feedback from the documentation team, ping [@NixOS/documentation-reviewers](https://github.com/orgs/nixos/teams/documentation-reviewers) on the pull request.
+If a pull request contains documentation changes that might require feedback from the documentation team, ping [@NixOS/documentation-team](https://github.com/orgs/nixos/teams/documentation-team) on the pull request.
 
 If you consider having enough knowledge and experience in a topic and would like to be a long-term reviewer for related submissions, please contact the current reviewers for that topic. They will give you information about the reviewing process. The main reviewers for a topic can be hard to find as there is no list, but checking past pull requests to see who reviewed or git-blaming the code to see who committed to that topic can give some hints.
 

doc/README.md

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 ## Getting help
 
-If you need documentation-specific help or reviews, ping [@NixOS/documentation-reviewers](https://github.com/orgs/nixos/teams/documentation-reviewers) on your pull request.
+If you need documentation-specific help or reviews, ping [@NixOS/documentation-team](https://github.com/orgs/nixos/teams/documentation-team) on your pull request.