Fix inconsistency in documentation

The page with the title "Project Configuration" was referred to as
"Project Setup". Moreover, it was contained in a file with the name
"project-setup.txt".

Change-Id: Iab834981893967bfbcba8214e118689ea348b93b
Signed-off-by: Stefan Lay <stefan.lay@sap.com>
Describe basics of side-by-side diff screen in review UI documentation

Change-Id: Iedfd06b1d64e67b8ec919ce043185039a904a9db
Signed-off-by: Edwin Kempin <edwin.kempin@sap.com>
Merge "Describe basics of side-by-side diff screen in review UI documentation" into stable-2.9
Merge "Fix inconsistency in documentation" into stable-2.9