Make documentation of parameters clearer

Co-Authored-By: Vasily <JustAMan@users.noreply.github.com>

Jellyfin.Api/Controllers/NotificationsController.cs

@@ -38,7 +38,7 @@ namespace Jellyfin.Api.Controllers
         /// Endpoint for getting a user's notifications.
         /// </summary>
         /// <param name="userId">The user's ID.</param>
-        /// <param name="isRead">An optional filter by IsRead.</param>
+        /// <param name="isRead">An optional filter by notification read state.</param>
         /// <param name="startIndex">The optional index to start at. All notifications with a lower index will be dropped from the results.</param>
         /// <param name="limit">An optional limit on the number of notifications returned.</param>
         /// <returns>A read-only list of all of the user's notifications.</returns>