small fix in quantiles vignette

vignettes/quantiles.qmd

@@ -35,6 +35,7 @@ quantile estimation using a flexible `BCPE` distribution. The model allows us to
 quantiles based on the predictors, providing a richer understanding of the underlying data.
 
 The model is estimated with.
+```{r}
 #| fig-height: 5
 #| fig-width: 6
 #| fig-align: center