fix: typo in command arg description

lord 😭

src/cmds/categories/create.ts

@@ -52,7 +52,7 @@ export default class CategoriesCreateCommand extends Command {
         name: 'preventDuplicates',
         type: Boolean,
         description:
-          'Prevents the creation of a new category if their is an existing category with a matching `categoryType` and `title`',
+          'Prevents the creation of a new category if there is an existing category with a matching `categoryType` and `title`',
       },
     ];
   }