chore(manifest): punctuate plugin description

Why:
- Obsidian plugin metadata validation warns when the manifest description does not end with punctuation.
- Keeping the manifest warning-free makes release checks and plugin review feedback easier to act on.

What:
- Add a trailing period to the plugin description in manifest.json.

manifest.json

@@ -3,7 +3,7 @@
 	"name": "Automatic Linker",
 	"version": "4.3.2",
 	"minAppVersion": "1.9.0",
-	"description": "Automatically converts plain text file references into wiki links (i.e. `[[...]]`)",
+	"description": "Automatically converts plain text file references into wiki links (i.e. `[[...]]`).",
 	"author": "Kodai Nakamura",
 	"isDesktopOnly": false
-}
+}