apply eslint-disable max-len around block comments that need to have a long line

The `@api ` lines can't have a line break in them because it would
cause the first part of the text to not be displayed on the apidocs
website.

Using `// eslint-disable-line max-len` at the end of an `@api `
line doesn't work, possibly because it's nesting a comment inside
a multi-line comment.

The only way I've found to ignore the `max-len` rule is to put
disable and enable comments around the whole comment block.

website/server/controllers/api-v3/tasks/groups.js

@@ -111,6 +111,7 @@ api.getGroupTasks = {
   },
 };
 
+/* eslint-disable max-len */
 /**
  * @api {post} /api/v3/group/:groupId/tasks/:taskId/move/to/:position Move group task to new position
  * @apiDescription Moves a group task to a specified position
@@ -124,6 +125,7 @@ api.getGroupTasks = {
  *
  * @apiSuccess {Array} data The new tasks order (group.tasksOrder.{task.type}s)
  */
+/* eslint-enable max-len */
 api.groupMoveTask = {
   method: 'POST',
   url: '/group-tasks/:taskId/move/to/:position',