Fix missing word

doc/user/project/members/index.md

@@ -28,7 +28,7 @@ From the image above, we can deduce the following things:
   there is an indication of an ancestor group and inherited Owner permissions.
 
 [From GitLab 12.6](https://gitlab.com/gitlab-org/gitlab/issues/21727), you can filter this list
-using dropdown on the right side:
+using the dropdown on the right side:
 
 ![Project members filter](img/project_members_filter_v12_6.png)