delete sentence about warning if non-zero first element (#825)

vignettes/EpiNow2.Rmd.orig

@@ -65,7 +65,6 @@ Users can also pass a non-parametric delay distribution vector using the `NonPar
 for both the generation interval and reporting delays. It is important to note that if doing so,
 both delay distributions are 0-indexed, meaning the first element corresponds to the probability mass
 at day 0 of an individual's infection. Because the discretised renewal equation doesn't support mass on day 0, the generation interval should be passed in as a 0-indexed vector with a mass of zero on day 0. 
-If this is not the case, a warning will indicate that the vector is being left-truncated and renormalized.
 
 ```{r}
 example_non_parametric_gi <-  NonParametric(pmf = c(0, 0.3, 0.5, 0.2))