Removed prefix from syntax (if we ever use it, it should display the server prefix instead)

src/main/java/com/alttd/proxydiscordlink/bot/commands/DiscordBroadCast.java

@@ -34,7 +34,7 @@ public class DiscordBroadCast extends DiscordCommand {
 
     @Override
     public String getSyntax() {
-        return "!broadcast";
+        return "broadcast";
     }
 
     @Override

src/main/java/com/alttd/proxydiscordlink/bot/commands/DiscordServerList.java

@@ -47,7 +47,7 @@ public class DiscordServerList extends DiscordCommand {
 
     @Override
     public String getSyntax() {
-        return "!serverlist";
+        return "serverlist";
     }
 
     @Override

src/main/java/com/alttd/proxydiscordlink/bot/commands/DiscordStaffList.java

@@ -41,7 +41,7 @@ public class DiscordStaffList extends DiscordCommand {
 
     @Override
     public String getSyntax() {
-        return "!StaffList";
+        return "staffList";
     }
 
     @Override