nixos/less: add lessopen=null default changelog entry to 25.05 (#367737)

Co-authored-by: Sandro <[email protected]>

Author: sarcasticadmin

nixos/doc/manual/release-notes/rl-2505.section.md

@@ -121,6 +121,8 @@
 
 - `linuxPackages.nvidiaPackages.dc_520` has been removed since it is marked broken and there are better newer alternatives.
 
+- `programs.less.lessopen` is now null by default. To restore the previous behaviour, set it to `''|${lib.getExe' pkgs.lesspipe "lesspipe.sh"} %s''`.
+
 - `minetest` has been renamed to `luanti` to match the upstream name change but aliases have been added. The new name hasn't resulted in many changes as of yet but older references to minetest should be sunset. See the [new name announcement](https://blog.minetest.net/2024/10/13/Introducing-Our-New-Name/) for more details.
 
 - `racket_7_9` has been removed, as it is insecure. It is recommended to use Racket 8 instead.