Clean a few minor things

[nikosbosse]

Description

This PR cleans up a few minor things:

• a typo in the docs
• missing @rdname statements
• a user message

[Describe the changes that you made in this pull request.]

Checklist

• [ ] My PR is based on a package issue and I have explicitly linked it.
• [ ] I have included the target issue or issues in the PR title as follows: issue-number: PR title
• [x] I have tested my changes locally.
• [x] I have added or updated unit tests where necessary.
• [x] I have updated the documentation if required.
• [x] I have built the package locally and run rebuilt docs using roxygen2.
• [x] My code follows the established coding standards and I have run lintr::lint_package() to check for style issues introduced by my changes.
• [x] I have added a news item linked to this PR.
• [ ] I have reviewed CI checks for this PR and addressed them as far as I am able.

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 95.54%. Comparing base (fbfbe56) to head (1229c96). Report is 4 commits behind head on main.

:exclamation: Current head 1229c96 differs from pull request most recent head 8e73873

Please upload reports for the commit 8e73873 to get more accurate results.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #814 +/- ## ======================================= Coverage 95.54% 95.54% ======================================= Files 21 21 Lines 1570 1573 +3 ======================================= + Hits 1500 1503 +3 Misses 70 70 ```

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