fix: [vps] make ``TARGET_VERSION`` of ``nextcloud upgrade`` actually work and document it properly

bin/vps

@@ -1903,7 +1903,7 @@ cmdline.spec::cmd:nextcloud:run() {
 cmdline.spec.gnu upgrade
 cmdline.spec:nextcloud:cmd:upgrade:run() {
 
-    : :posarg: [TARGET_VERSION]  "Source cyclos dump file to restore"
+    : :posarg: [TARGET_VERSION]  "Target version to migrate to"
     : :optval: --service,-s      "The nexcloud service name (defaults to 'nextcloud')"
 
     local URL
@@ -1929,7 +1929,7 @@ cmdline.spec:nextcloud:cmd:upgrade:run() {
     ##    like relation resolution.
     ## --no-hint to remove the final hint about modifying your
     ##    ``compose.yml``.
-    compose -q upgrade "$nextcloud_service" --no-hint
+    compose -q upgrade "$nextcloud_service" --no-hint "$TARGET_VERSION"
     errlvl="$?"
 
     after_version=$(nextcloud:src:version)