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Checklist
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- [ ] I have read the [Contribution Guidelines](https://github.com/restic/restic/blob/master/CONTRIBUTING.md#providing-patches)
- [ ] I have added tests for all changes in this PR
- [ ] I have added documentation for the changes (in the manual)
- [ ] There's a new file in `changelog/unreleased/` that describes the changes for our users (template [here](https://github.com/restic/restic/blob/master/changelog/TEMPLATE))
- [ ] I have run `gofmt` on the code in all commits
- [ ] All commit messages are formatted in the same style as [the other commits in the repo](https://github.com/restic/restic/blob/master/CONTRIBUTING.md#git-commits)
- [ ] I'm done, this Pull Request is ready for review

Add hint for "closes" wording to PR template
Add hint for "closes" wording to PR template
