[doc bug fix] for example of package[...]

[radbasa]

Closes #79

Description

• Example used path/to/package[...]. Example should be package[...].

Definition of Done

• [ ] The change is thoroughly documented.
• [ ] The CI passes (R CMD check, linter, unit tests, spelling).
• [ ] Any generated files have been updated (e.g. .Rd files with roxygen2::roxygenise())