.github/PULL_REQUEST_TEMPLATE.md: fix typo

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.github
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.github/PULL_REQUEST_TEMPLATE.md
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- NixOS Release Notes
- [ ] Module addition: when adding a new NixOS module.
- [ ] Module update: when the change is significant.
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- [ ] Fits [CONTRIBUTING.md], [pkgs/README.md], [maintainers/README.md] and others READMEs.
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- [ ] Fits [CONTRIBUTING.md], [pkgs/README.md], [maintainers/README.md] and other READMEs.
[NixOS tests]: https://nixos.org/manual/nixos/unstable/index.html#sec-nixos-tests
[Package tests]: https://github.com/NixOS/nixpkgs/blob/master/pkgs/README.md#package-tests