Explain stash.
Detail the merge window.
People keep adding http:// in front of the host.
 Merge branch 'merge-window' into 'master'

Merge Window
 Merge branch 'host-no-scheme' into 'master'

Host No Scheme

People keep adding http in front of the host FQDN, this comment informs them this is not needed.

https://groups.google.com/forum/#!topic/gitlabhq/HPOn51ZcQFs
 Merge branch 'stash-pgrade' into 'master'

Document the stash of changes during the upgrade