#207 updates to `derive_param_computed()` calls in vignette and template

[manciniedoardo]

Closes #207

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• [ ] Code is formatted according to the tidyverse style guide. Run styler::style_file() to style R and Rmd files
• [ ] Updated relevant unit tests or have written new unit tests - See Unit Test Guide
• [ ] If you removed/replaced any function and/or function parameters, did you fully follow the deprecation guidance?
• [ ] Update to all relevant roxygen headers and examples.
• [ ] Run devtools::document() so all .Rd files in the man folder and the NAMESPACE file in the project root are updated appropriately
• [ ] Address any updates needed for vignettes and/or templates
• [ ] Update NEWS.md if the changes pertain to a user-facing function (i.e. it has an @export tag) or documentation aimed at users (rather than developers)
• [ ] Build admiral site pkgdown::build_site() and check that all affected examples are displayed correctly and that all new functions occur on the "Reference" page.
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