update request access screenshot

content/1.help/2.Contributing-Wiki.md

@@ -15,11 +15,11 @@ If you have neither, register on Github first (it's always useful).
 
 ![Register](/help/register_1.png){max-width=750px}
 
-Once your account is created, you need to request access to the project, on the [gitlab page of the wiki](https://gitlab.pasteur.fr/mdm-lab/wiki) of the repo, there is a small link to request access.
+Once your account is created, you need to request access to the project, on the [gitlab page of the wiki](https://gitlab.pasteur.fr/mdm-lab/wiki) of the repo, there is a link to request access.
 
 ![Request Access](/help/Request_access.png){max-width=600px}
 
-Click, and wait for admin approval.
+Click, and wait for an admin approval.
 
 ## 2/ Edit a page