moving doc.wikimedia.org to misc-web-lb

DNS change to move doc.wikimedia.org behind the misc-web-lb, this change
will roll live at the same time as
I2fe62629f4deaf4c1ace4345ba7c743b84469fd9

Change-Id: Ie80551a532dbc32cbc9c0d73c396e88f63fcb0b3
RT: 6594