clarifying the 'push' atomic update docs
clarifying the 'push' atomic update docs

the first time I read this I was all like... "no duh it will remove either the first or the last, but which does it do???"

sourcelair/mongoengine,Davidrjx/mongoengine,starsirius/mongoengine,MRigal/mongoengine,9nix00/mongoengine,cogniteev/mongoengine,cogniteev/mongoengine,elephanter/mongoengine,larsbutler/mongoengine,Davidrjx/mongoengine,MakerReduxCorp/mongoengine,ms5/mongoengine,MakerReduxCorp/mongoengine,blaggacao/mongoengine,WingGao/mongoengine,losintikfos/mongoengine,ProgressivePlanning/mongoengine,reallistic/mongoengine,nathanial/mongoengine,prijindal/mongoengine,noirbizarre/mongoengine,Catstyle/mongoengine,ConsumerPhysics/mongoengine,RussellLuo/mongoengine,gavincabbage/mongoengine,gmacon/mongoengine,muhammad-ammar/mongoengine,DavidBord/mongoengine,jimmyshen/mongoengine,yarneo/mongoengine,iandd0824/mongoengine,MongoEngine/mongoengine,khallaghi/mongoengine,nicolascine/mongoengine,eli-b/mongoengine,touilleMan/mongoengine