Fixed typo

ref #49

src/controllers/TrackController.ts

@@ -61,7 +61,7 @@ export class TrackController {
 	@ResponseSchema(ResponseTrack)
 	@ResponseSchema(TrackNotFoundError, { statusCode: 404 })
 	@ResponseSchema(TrackIdsNotMatchingError, { statusCode: 406 })
-	@OpenAPI({ description: "Update the track whose id you provided. <br> Please remember that id's can't be changed." })
+	@OpenAPI({ description: "Update the track whose id you provided. <br> Please remember that ids can't be changed." })
 	async put(@Param('id') id: number, @EntityFromBody() track: Track) {
 		let oldTrack = await this.trackRepository.findOne({ id: id });