Remove "scroll" option from security:searchRoles doc (#546)

What does this PR do?
Remove "scroll" option from security:searchRoles doc

Other change
Change script test name for admin console tests

Author: Yoann-Abbes

doc/7/controllers/security/search-roles/index.md

@@ -35,7 +35,6 @@ searchRoles([body], [options]);
 | `queuable` | <pre>boolean</pre><br/>(`true`) | If true, queues the request during downtime, until connected to Kuzzle again                                                                                                                                      |
 | `from`     | <pre>number</pre><br/>(`0`)     | Offset of the first document to fetch                                                                                                                                                                             |
 | `size`     | <pre>number</pre><br/>(`10`)    | Maximum number of documents to retrieve per page                                                                                                                                                                  |
-| `scroll`   | <pre>string</pre><br/>(`""`)    | When set, gets a forward-only cursor having its ttl set to the given value (ie `30s`; cf [elasticsearch time limits](https://www.elastic.co/guide/en/elasticsearch/reference/7.3/common-options.html#time-units)) |
 
 ## Resolves