Fixed wrong config attribute name in upgrading section.
Fixed wrong config attribute name in upgrading section.

wasabia/bnbtripSorcery,NoamB/sorcery,kristianmandrup/sorcery,alexanderedge/sorcery,Borzik/sorcery,rubenmoya/sorcery,Sology/sorcery,alexanderedge/sorcery,ikhakoo/sorcery,athix/sorcery,NoamB/sorcery,ikhakoo/sorcery,Sology/sorcery,athix/sorcery,jshum/sorcery,Sorcery/sorcery,webgago/sorcery,Sorcery/sorcery,wendy0402/sorcery,wendy0402/sorcery,creepycheese/sorcery,jshum/sorcery,kristianmandrup/sorcery,wasabia/bnbtripSorcery,Borzik/sorcery,Sorcery/sorcery,trustyknave/sorcery,athix/sorcery,creepycheese/sorcery,trustyknave/sorcery,rubenmoya/sorcery,jerefrer/sorcery,jerefrer/sorcery,webgago/sorcery