Fix steps numbering

doc/update/9.2-to-9.3.md

@@ -117,7 +117,7 @@ cd /home/git/gitlab
 sudo -u git -H git checkout 9-3-stable-ee
 ```
 
-### 5. Update gitlab-shell
+### 7. Update gitlab-shell
 
 ```bash
 cd /home/git/gitlab-shell
@@ -127,7 +127,7 @@ sudo -u git -H git checkout v$(</home/git/gitlab/GITLAB_SHELL_VERSION)
 sudo -u git -H bin/compile
 ```
 
-### 6. Update gitlab-workhorse
+### 8. Update gitlab-workhorse
 
 Install and compile gitlab-workhorse. This requires
 [Go 1.5](https://golang.org/dl) which should already be on your system from
@@ -143,7 +143,7 @@ sudo -u git -H git checkout v$(</home/git/gitlab/GITLAB_WORKHORSE_VERSION)
 sudo -u git -H make
 ```
 
-### 7. Update Gitaly
+### 9. Update Gitaly
 
 If you have not yet set up Gitaly then follow [Gitaly section of the installation
 guide](../install/installation.md#install-gitaly).