Consistent use of sentence-case in titles

vignettes/primarycensoreddist.Rmd

@@ -45,7 +45,7 @@ library(ggplot2)
 set.seed(123)
 ```
 
-# Generating Random Samples with `rprimarycensoreddist()`
+# Generating random samples with `rprimarycensoreddist()`
 
 This function generates random samples from a primary event censored distribution. It adjusts the distribution by accounting for the primary event distribution, potential truncation at a maximum delay ($D$), and secondary event censoring.