fix: fixed formatting in RSSEmbed

Signed-off-by: moonleay <contact@moonleay.net>

src/main/kotlin/net/moonleay/rssbot/util/MessageUtil.kt

@@ -186,7 +186,7 @@ object MessageUtil {
             this.name = author
             this.icon = logo
         }
-        ebb.description = "${if (description != "No description") description else ""}\n[[open full article]]($url)"
+        ebb.description = "${if (description != "No description") description else ""}\n[[open full article]($url)]"
         ebb.color = color.color.color
         ebb.footer {
             this.text = "> rssbot, ($feedName) \n/ pub $published \n/ rel ${dtf.format(now)}"