Fixed typo

ref #49

src/controllers/UserController.ts

@@ -70,7 +70,7 @@ export class UserController {
 	@ResponseSchema(User)
 	@ResponseSchema(UserNotFoundError, { statusCode: 404 })
 	@ResponseSchema(UserIdsNotMatchingError, { statusCode: 406 })
-	@OpenAPI({ description: "Update the user whose id you provided. <br> To change the permissions directly granted to the user please use /api/permissions instead. <br> Please remember that id's can't be changed." })
+	@OpenAPI({ description: "Update the user whose id you provided. <br> To change the permissions directly granted to the user please use /api/permissions instead. <br> Please remember that ids can't be changed." })
 	async put(@Param('id') id: number, @Body({ validate: true }) updateUser: UpdateUser) {
 		let oldUser = await this.userRepository.findOne({ id: id });