Update image in FF-merge doc

doc/user/project/merge_requests/fast_forward_merge.md

@@ -43,7 +43,7 @@ You can also rebase without running a CI/CD pipeline.
 
 The rebase action is also available as a [quick action command: `/rebase`](../../../topics/git/git_rebase.md#rebase-from-the-gitlab-ui).
 
-![Fast forward merge request](img/ff_merge_rebase_v14_7.png)
+![Fast forward merge request](img/ff_merge_rebase_v14_9.png)
 
 If the target branch is ahead of the source branch and a conflict free rebase is
 not possible, you need to rebase the