Fixes DIUN_NOTIF_NTFY_TAGS value in example

Author: blueberryapple

docs/config/index.md

@@ -191,7 +191,7 @@ Can be transposed to:
 
     DIUN_NOTIF_NTFY_ENDPOINT=https://ntfy.sh
     DIUN_NOTIF_NTFY_TOPIC=diun-acce65a0-b777-46f9-9a11-58c67d1579c4
-    DIUN_NOTIF_NTFY_TAGS=["whale"]
+    DIUN_NOTIF_NTFY_TAGS=whale
     DIUN_NOTIF_NTFY_TIMEOUT=10s
 
     DIUN_NOTIF_TELEGRAM_TOKEN=aabbccdd:11223344