Fix description in metadata.json.in, to reflect cofigurability.

data/metadata.json.in

@@ -1,8 +1,8 @@
 {
 "uuid": "@uuid@",
 "name": "Panel OSD",
-"description": "Place shell notifications under the panel instead of above the message-tray",
 "shell-version": [ "3.6", "3.8", "3.10", "3.11.5", "3.11.90" ],
+"description": "Configuring where on the (main) screen notifications will appear, instead of just above the message tray",
 "localedir": "@LOCALEDIR@",
 "url": "@url@"
 }