docs: add period to description in manifest.json

- Updated description in manifest.json to include a period.
- Ensured consistency in plugin metadata formatting.

manifest.json

@@ -3,7 +3,7 @@
 	"name": "Full Path",
 	"version": "0.0.1",
 	"minAppVersion": "0.15.0",
-	"description": "Display the full path instead of just the file name",
+	"description": "Display the full path instead of just the file name.",
 	"author": "Kodai Nakamura",
 	"isDesktopOnly": false
 }