Merge branch 'docs-update-instal-guide-10-7' into 'master'

Updates installation and update guides

See merge request gitlab-org/gitlab-ce!18337

doc/install/installation.md

@@ -301,7 +301,7 @@ sudo usermod -aG redis git
 ### Clone the Source
 
     # Clone GitLab repository
-    sudo -u git -H git clone https://gitlab.com/gitlab-org/gitlab-ce.git -b 10-6-stable gitlab
+    sudo -u git -H git clone https://gitlab.com/gitlab-org/gitlab-ce.git -b 10-7-stable gitlab
 
 **Note:** You can change `10-6-stable` to `master` if you want the *bleeding edge* version, but never install master on a production server!