rtmp-services: Update Mildom more_info_link (#8334)

Co-authored-by: kevin.dww <[email protected]>

plugins/rtmp-services/data/services.json

@@ -2312,7 +2312,7 @@
         },
         {
             "name": "Mildom",
-            "more_info_link": "https://www.mildom.com/course/pc",
+            "more_info_link": "https://support.mildom.com/hc/ja/articles/360056569954",
             "stream_key_link": "https://www.mildom.com/creator/live",
             "servers": [
                 {