change '/group/' to '/groups/' in docs for /api/v3/challenges/groups/:groupId

test/api/v3/integration/challenges/GET-challenges_group_groupid.test.js

@@ -5,7 +5,7 @@ import {
   translate as t,
 } from '../../../../helpers/api-v3-integration.helper';
 
-describe('GET challenges/group/:groupId', () => {
+describe('GET challenges/groups/:groupId', () => {
   context('Public Guild', () => {
     let publicGuild, user, nonMember, challenge, challenge2;
 

website/server/controllers/api-v3/challenges.js

@@ -247,7 +247,7 @@ api.getUserChallenges = {
 };
 
 /**
- * @api {get} /api/v3/challenges/group/:groupId Get challenges for a group
+ * @api {get} /api/v3/challenges/groups/:groupId Get challenges for a group
  * @apiDescription Get challenges that the user is a member, public challenges and the ones from the user's groups.
  * @apiName GetGroupChallenges
  * @apiGroup Challenge