fix typo

Author: Kucharssim

exercises.qmd

@@ -72,4 +72,4 @@ This notebook provides you with a basic application of BayesFlow in the context
 - Notebook [here](./exercises/bayesflow-diffusion-covar.ipynb){target="_blank"}
 - Download data: [here](./exercises/flash.csv){target="_blank"}
 
-In this notebook (courtesy of Leendert van Maanen), you can fit a Racing diffusion model where the decision thresholds decreases as a function of trial number, modeling a behavior of a participant who is becoming more and more impatient the longer the experiment keeps going.
+In this notebook (courtesy of Leendert van Maanen), you can fit a Racing diffusion model where the decision threshold decreases as a function of trial number, modeling behavior of a participant who is becoming more and more impatient the longer the experiment keeps going.