fix: removed lie about username inference

src/core/discord/addUsernameChoices.ts

@@ -3,8 +3,6 @@ import { SlashCommandStringOption } from 'discord.js';
 export default function addUsernameChoices(option: SlashCommandStringOption) {
   return option
     .setName('username')
-    .setDescription(
-      'The username you use in Blitz (inferred from Discord nickname by default)',
-    )
+    .setDescription('The username you use in Blitz')
     .setAutocomplete(true);
 }