docs: add visual explanations for high dose hook effect

[Fersoil]

URL

https://mini-pw.github.io/PvSTATEM/reference/handle_high_dose_hook.html

Checklist

• I added a very descriptive title to this issue.
• I used the GitHub search to find a similar question and didn't find it.
• The bug is not resolved by updating to the latest stable version of PvSTATEM package.
• I included a link to the documentation page I am referring to (if applicable).

Issue with current documentation:

The description of the problem is well written. I think it would be good to see an example of such behaviour (even on artificial plate) in the example section

Idea or request for content:

Ideally, we could add a plot with the dilution values that present a non-monotonic behaviour and a threshold value