message: API: Add LectureController docs
diff: @@ -30,6 +30,9 @@ export class LectureController {
  * "__v": 0,
  * "units": []
  * }
  + *
  + * @apiError NotFoundError If the lecture couldn't be found.
  + * @apiError ForbiddenError userCanViewCourse check failed.
  */
  @Get('/:id')
  async getLecture(@Param('id') id: string, @CurrentUser() currentUser: IUser) {
  @@ -65,6 +68,9 @@ export class LectureController {
  * "__v": 0,
  * "units": []
  * }
  + *
  + * @apiError NotFoundError If the courseId couldn't be found.
  + * @apiError ForbiddenError userCanEditCourse check failed.
  */
  @Authorized(['teacher', 'admin'])
  @Post('/')
  @@ -109,6 +115,9 @@ export class LectureController {
  * "__v": 0,
  * "units": []
  * }
  + *
  + * @apiError NotFoundError If the lecture's course couldn't be found.
  + * @apiError ForbiddenError userCanEditCourse check failed.
  */
  @Authorized(['teacher', 'admin'])
  @Put('/:id')
  @@ -137,6 +146,9 @@ export class LectureController {
  *
  * @apiSuccessExample {json} Success-Response:
  * {}
  + *
  + * @apiError NotFoundError If the lecture's course couldn't be found.
  + * @apiError ForbiddenError userCanEditCourse check failed.
  */
  @Authorized(['teacher', 'admin'])
  @Delete('/:id')
  