Document which principal does the AD provider use
Signed-off-by: Fabiano FidĂȘncio <fidencio@redhat.com>
(cherry picked from commit b6696d97c474438484a485c5698ba820634389e9)
(cherry picked from commit 15af9187cfced0b2a0e0942d5d80aaa650c3071d)
(cherry picked from commit 28ce4615a4983c424e0be199a396f86f653c21a7)