Merge branch '8-12-guide-updates' into 'master'

Some minor updates to upgrade guides for 8.12.

See merge request !6154

doc/install/installation.md

@@ -268,9 +268,9 @@ 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 8-11-stable gitlab
-**Note:** You can change `8-11-stable` to `master` if you want the *bleeding edge* version, but never install master on a production server!
+    sudo -u git -H git clone https://gitlab.com/gitlab-org/gitlab-ce.git -b 8-12-stable gitlab
+**Note:** You can change `8-12-stable` to `master` if you want the *bleeding edge* version, but never install master on a production server!
 ### Configure It

doc/update/8.11-to-8.12.md

@@ -82,7 +82,7 @@ GitLab 8.1.
 ```bash
 cd /home/git/gitlab-workhorse
 sudo -u git -H git fetch --all
-sudo -u git -H git checkout v0.7.8
+sudo -u git -H git checkout v0.7.11
 sudo -u git -H make
 ```