updated api docs

doc/api/merge_request_approvals.md

@@ -25,7 +25,10 @@ GET /projects/:id/approvals
 {
   "approvals_before_merge": 2,
   "reset_approvals_on_push": true,
-  "disable_overriding_approvers_per_merge_request": false
+  "disable_overriding_approvers_per_merge_request": false,
+  "merge_requests_author_approval": true,
+  "merge_requests_disable_committers_approval": false,
+  "require_password_to_approve": true
 }
 ```
 
@@ -50,6 +53,7 @@ POST /projects/:id/approvals
 | `disable_overriding_approvers_per_merge_request` | boolean | no       | Allow/Disallow overriding approvers per MR                                                          |
 | `merge_requests_author_approval`                 | boolean | no       | Allow/Disallow authors from self approving merge requests; `true` means authors cannot self approve |
 | `merge_requests_disable_committers_approval`     | boolean | no       | Allow/Disallow committers from self approving merge requests                                        |
+| `require_password_to_approve`                    | boolean | no       | Require approver to enter a password in order to authenticate before adding the approval         |
 
 ```json
 {
@@ -57,7 +61,8 @@ POST /projects/:id/approvals
   "reset_approvals_on_push": true,
   "disable_overriding_approvers_per_merge_request": false,
   "merge_requests_author_approval": false,
-  "merge_requests_disable_committers_approval": false
+  "merge_requests_disable_committers_approval": false,
+  "require_password_to_approve": true
 }
 ```
 
@@ -441,7 +446,10 @@ PUT /projects/:id/approvers
   ],
   "approvals_before_merge": 2,
   "reset_approvals_on_push": true,
-  "disable_overriding_approvers_per_merge_request": false
+  "disable_overriding_approvers_per_merge_request": false,
+  "merge_requests_author_approval": true,
+  "merge_requests_disable_committers_approval": false,
+  "require_password_to_approve": true
 }
 ```