Remove support in docs for modmail api

Author: kyb3r

app.json

@@ -15,17 +15,13 @@
         "description": "Comma separated user IDs of people that are allowed to use owner only commands. (eval and update)",
         "required": true
     },
-    "MODMAIL_API_TOKEN": {
-        "description": "API token from https://modmail.tk",
-        "required": false
-    },
     "MONGO_URI": {
         "description": "Mongo DB connection URI for selfhosting your data.",
-        "required": false
+        "required": true
     },
     "LOG_URL": {
         "description": "The url of the logviewer app for viewing selfhosted logs",
-        "required": false
+        "required": true
     }
   }
 }