fix argument name

Author: avallecam

episodes/superspreading-simulate.Rmd

@@ -336,9 +336,9 @@ In the lines above, we described how to specify the offspring distribution and g
 
 ### Stopping criteria
 
-This is an customisable feature of `{epichains}`. By default, branching process simulations end when they have gone extinct. For long-lasting transmission chains, in `simulate_chains()` you can add the `stat_max` argument. 
+This is an customisable feature of `{epichains}`. By default, branching process simulations end when they have gone extinct. For long-lasting transmission chains, in `simulate_chains()` you can add the `stat_threshold` argument. 
 
-For example, if we set an stopping criteria for `statistic = "size"` of `stat_max = 500`, no more offspring will be produced after a chain of size 500.
+For example, if we set an stopping criteria for `statistic = "size"` of `stat_threshold = 500`, no more offspring will be produced after a chain of size 500.
 
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