refactor(services): remove duplicate comments in category.service.ts

Duplicate comments were found and removed from `category.service.ts`. This refactoring step will make the code cleaner and less confusing.

Signed-off-by: Mathis <yidhra@tuta.io>

src/services/category.service.ts

@@ -1,5 +1,3 @@
-//FEAT Create new category
-//FEAT Create new category
 import type { IDbCategory } from "@interfaces/database/IDbCategory";
 import MysqlService from "@services/mysql.service";
 import {Logger} from "tslog";