Fix mentions in guides

main.js

@@ -69,9 +69,9 @@ function isAuthorised(member) {
 }
 
 const commands = {
-    "make guide": (msg, s) => {
+    "make guide": msg => {
         if (!isAuthorised(msg.member)) return;
-        let content = s.substring("make guide ".length);
+        let content = msg.content.substring(msg.content.indexOf("make guide") + "make guide ".length);
         let guideName = content.substring(0, content.indexOf("\n")).trim();
         let guideContent = content.substring(content.indexOf("\n")).trim();