nixos/dokuwiki: Note Caddy changes in release notes

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

@@ -73,6 +73,10 @@
 
 - `nodePackages.expo-cli` has been removed, as it was deprecated by upstream. The suggested replacement is the `npx expo` command.
 
+- DokuWiki with the Caddy webserver (`services.dokuwiki.webserver = "caddy"`) now sets up sites with Caddy's automatic HTTPS instead of HTTP-only.
+  To keep the old behavior for a site `example.com`, set `services.caddy.virtualHosts."example.com".hostName = "http://example.com"`.
+  If you set custom Caddy options for a DokuWiki site, migrate these options by removing `http://` from `services.caddy.virtualHosts."http://example.com"`.
+
 - `vscode-utils.buildVscodeExtension` now requires pname as an argument
 
 - `nerdfonts` has been separated into individual font packages under the namespace `nerd-fonts`. The directories for font