Deleted a TODO, because I implemented it.

rs/nns/governance/unreleased_changelog.md

@@ -14,12 +14,6 @@ do NOT add an entry to this file, because this new function has no user-visible
 behavior change yet. Wait until an actual call is added before adding an entry
 to this file.
 
-TODO: Automate step 2. by modifying the script that composes the proposal
-summary. It might be helpful to look at nns-dapp's [split-changelog] script for
-inspiration.
-
-[split-changelog]: https://github.com/dfinity/nns-dapp/blob/main/scripts/nns-dapp/split-changelog
-
 TODO: Perhaps, the script that drafts the proposal summary can also move content
 from here to CHANGELOG.md (step 3.). OTOH, it might be better if this is done by
 a second (new) script, because the proposal ID is not known until later?