do-release-upgrade: add Dutch translation (#9362)

pages.nl/linux/do-release-upgrade.md

@@ -0,0 +1,16 @@
+# do-release-upgrade
+
+> De Ubuntu release upgrader.
+> Meer informatie: <https://ubuntu.com/server/docs/upgrade-introduction>.
+
+- Upgrade naar de laatste release:
+
+`sudo do-release-upgrade`
+
+- Upgrade naar de laatste development release:
+
+`sudo do-release-upgrade --devel-release`
+
+- Upgrade naar de laatste voorgestelde release:
+
+`sudo do-release-upgrade --proposed`