Update text to be consistent with use of which model

[athowes]

For example:

epidist/vignettes/epidist.Rmd

Lines 264 to 279 in 2787d61

	The main function you will use for modelling is called `epidist()`^[Technically, `epidist()` is an [S3 generic](http://adv-r.had.co.nz/S3.html) which allows it to work differently for inputs of different classes. This is in part why inputs must be prepared first via `as_epidist_latent_model()` so that they are of the appropriate class!].
	We will fit the model `"epidist_latent_model"` which uses latent variables for the time of primary and secondary event of each individual^[In a future vignette, we will explain in more detail the structure of the model!].
	To do so, we first prepare the `data` using `as_epidist_latent_model()`:
	```{r}
	linelist_data <- as_epidist_linelist_data(
	obs_cens_trunc_samp$ptime_lwr,
	obs_cens_trunc_samp$ptime_upr,
	obs_cens_trunc_samp$stime_lwr,
	obs_cens_trunc_samp$stime_upr,
	obs_time = obs_cens_trunc_samp$obs_time
	)
	data <- as_epidist_marginal_model(linelist_data)
	class(data)
	```

• Also remove any mention of "latent individual"
• Also it looks like on the website it hasn't updated to be using the marginal model at all?