evaluate extreme dispersion parameter for MERS

This dispersion parameter seems quite extreme? We estimated k = 0.26 (90% CI: 0.11–0.87, 95% CI: 0.09–1.24) - https://www.eurosurveillance.org/content/10.2807/1560-7917.ES2015.20.25.21167 – although this was not analysing the Korea outbreak.

_Originally posted by @adamkucharski in https://github.com/epiverse-trace/tutorials-middle/pull/29#discussion_r1559287163_

> Regarding the extreme k = 0.02. Should we try to look for studies that estimated and published this from the [MERS data](https://www.eurosurveillance.org/content/10.2807/1560-7917.ES2013.18.39.20596)? This k value is the one estimated in the [superspreading-estimate](https://github.com/epiverse-trace/tutorials-middle/blob/3e536a4a6406e5618c8e102c984ff6a9dbfe40f9/episodes/superspreading-estimate.Rmd#L321-L331) episode using `{fitdistrplus}`. Should we add some additional context as papers on MERS with complementary estimates in a callout?