Add NEWS bullet

NEWS.md

@@ -4,7 +4,10 @@
 * Remove redundant entries in the documentation index when multiple explicit `@usage` tags are provided (@klmr, #2302)
 * The article index now sorts vignettes and non-vignette articles alphabetically by their filename (literally, their `basename()`), by default (@jennybc, #2253).
 * Add Catalan translation (@jmaspons, #2333)
-* Set RNG seed for htmlwidgets IDs. This reduces noise in pkgdown reference HTML output when examples generate htmlwidgets (@salim-b, #2294).
+* Set RNG seed before building articles by default. Use `build_articles(seed = NULL)` for the old (unreproducible) behaviour. (@salim-b, #2354).
+* Set RNG seed for htmlwidgets IDs. This reduces noise in final HTML output,
+  both for articles and examples in the reference that contain htmlwidgets
+  (@salim-b, #2294, #2354).
 
 # pkgdown 2.0.7