Luftwaffe doc missing stuff

[Warhawks97]

1. Gebis cant retreat to luftwaffe leader squad or to the flag this squad plants. They only get the bonuses from the luftwaffe leader squad. But the Gebis have to retreat to hauptsturmführer. That means you need two commander units when you play gebis with fallis.

2. Luftwaffe leader squad doesnt get vet lvl from vet unlock.