async api role 문서화 시 타이틀 추가 (#46)

doc: async api role 문서화 시 타이틀 추가

프론트엔드 코드젠 시 title로 enum이름을 생성하기에 추가

Author: rrgks6221

src/modules/game-room/events/game-room-member-joined/game-room-member-joined-socket.event.ts

@@ -12,6 +12,7 @@ class GameRoomMemberJoinedSocketEventBody {
   gameRoomId: string;
 
   @ApiProperty({
+    title: 'GameRoomMemberRole',
     enum: GameRoomMemberRole,
     enumName: 'GameRoomMemberRole',
   })