docs: 발표자료 Swagger tag 추가

Author: chw0912

src/main/java/com/oronaminc/join/document/api/DocumentController.java

@@ -7,12 +7,14 @@
 import com.oronaminc.join.member.security.MemberDetails;
 import io.swagger.v3.oas.annotations.Operation;
 import io.swagger.v3.oas.annotations.responses.ApiResponse;
+import io.swagger.v3.oas.annotations.tags.Tag;
 import jakarta.validation.Valid;
 import lombok.RequiredArgsConstructor;
 import org.springframework.http.HttpStatus;
 import org.springframework.security.core.annotation.AuthenticationPrincipal;
 import org.springframework.web.bind.annotation.*;
 
+@Tag(name = "발표자료")
 @RestController
 @RequiredArgsConstructor
 @RequestMapping("/api/documents")