Fix a typo in NEWS (#3488)

Author: yutannihilation

NEWS.md

@@ -20,7 +20,7 @@
 
 * Added function `ggplot_add.by()` for lists created with `by()` (#2734, @Maschette)
 
-* `ggdep()` was deprecated (@perezp44, #3382).
+* `gg_dep()` was deprecated (@perezp44, #3382).
 
 * Added weight aesthetic option to `stat_density()` and made scaling of 
   weights the default (@annennenne, #2902)