Docs: Return correct Quota return type (coscine/issues#2008)

src/Project/Controllers/ProjectController.cs

@@ -170,7 +170,7 @@ namespace Coscine.Api.Project.Controllers
         /// <param name="projectId">Id of the project.</param>
         /// <returns>List of project quotas</returns>
         [HttpGet("[controller]/{projectId}/quota/-/all")]
-        public ActionResult<IEnumerable<ProjectQuota>> Quotas(string projectId)
+        public ActionResult<IEnumerable<ProjectQuotaReturnObject>> Quotas(string projectId)
         {
             var user = _authenticator.GetUser();