Merge branch 'docs/install-by-branch' into 'master'

Use the branch instead of the tag to install

Closes #48341

See merge request gitlab-org/gitlab-ce!20169

doc/install/installation.md

@@ -12,9 +12,8 @@ Since installations from source don't have Runit, Sidekiq can't be terminated an
 
 ## Select Version to Install
 
-Make sure you view [this installation guide](https://gitlab.com/gitlab-org/gitlab-ce/blob/master/doc/install/installation.md) from the tag (version) of GitLab you would like to install.
-In most cases this should be the highest numbered production tag (without rc in it).
-You can select the tag in the version dropdown in the top left corner of GitLab (below the menu bar).
+Make sure you view [this installation guide](https://gitlab.com/gitlab-org/gitlab-ce/blob/master/doc/install/installation.md) from the branch (version) of GitLab you would like to install (e.g., `11-0-stable`).
+You can select the branch in the version dropdown in the top left corner of GitLab (below the menu bar).
 
 If the highest number stable branch is unclear please check the [GitLab Blog](https://about.gitlab.com/blog/) for installation guide links by version.
 

doc/update/10.8-to-11.0.md

@@ -4,10 +4,9 @@ comments: false
 
 # From 10.8 to 11.0
 
-Make sure you view this update guide from the tag (version) of GitLab you would
-like to install. In most cases this should be the highest numbered production
-tag (without rc in it). You can select the tag in the version dropdown at the
-top left corner of GitLab (below the menu bar).
+Make sure you view this update guide from the branch (version) of GitLab you would
+like to install (e.g., `11-0-stable`. You can select the branch in the version
+dropdown at the top left corner of GitLab (below the menu bar).
 
 If the highest number stable branch is unclear please check the
 [GitLab Blog](https://about.gitlab.com/blog/archives.html) for installation