NEWS.md: Fill in the correct PR number.

Author: fweber144

NEWS.md

@@ -10,7 +10,7 @@
 
 * On the y axis, `ppc_loo_pit_qq(..., compare = "normal")` now plots standard
   normal quantiles calculated from the PIT values (instead of the standardized
-  PIT values). (#240, #<PR_number>, @fweber144)
+  PIT values). (#240, #243, @fweber144)
 
 * New plotting function `ppc_km_overlay()` for outcome variables that are   
   right-censored. Empirical CCDF estimates of `yrep` are compared with the