fix: [object Object]

package.json

@@ -1,6 +1,6 @@
 {
   "name": "muffinbot",
-  "version": "3.2.0-cake.r240930a",
+  "version": "3.2.1-cake.r241004a",
   "main": "dist/index.js",
   "private": true,
   "dependencies": {

src/Commands/learn.ts

@@ -31,8 +31,8 @@ class LearnCommand extends Command {
       return await msg.reply(
         codeBlock(
           'md',
-          `사용법: ${this.detailedDescription}
-          예시: ${this.detailedDescription.examples?.map(example => example).join('\n')}`,
+          `사용법: ${this.detailedDescription.usage}\n` +
+            `예시: ${this.detailedDescription.examples?.map(example => example).join('\n')}`,
         ),
       )
     }