Rename truncation() to truncate_linelist()

[joshwlambert]

This PR addresses #186 by renaming the truncation() function to truncate_linelist().

This follows the point added to the design-principles.Rmd vignette in #187 that post-processing function in {simulist} should follow the naming convention *_linelist(), to 1) make it clear they are operating on a line list <data.frame> output from sim_linelist() (or the first list element of sim_outbreak()), and 2) to avoid namespace conflicts with other functions, for example the truncate() function in base R and the messy() function from the {messy} package. (On the former naming conflict, truncate() and therefore truncate_linelist() starting with a verb is preferable to truncation()).

This PR also tries to correct the hyphenation of "right-truncation" when used as an adjective and "right truncation" when used as a noun, as pointed out by @sbfnk in #179.

[joshwlambert]

The lint-changed-files workflow is failing since the release of {lintr} v3.2.0 last week. I will fix in a separate PR as the changes required are orthogonal to the changes in this PR.