Update docstring [ticket:873]
Update docstring [ticket:873]

alex/sqlalchemy,inspirehep/sqlalchemy,davidjb/sqlalchemy,Cito/sqlalchemy,dstufft/sqlalchemy,sqlalchemy/sqlalchemy,olemis/sqlalchemy,elelianghh/sqlalchemy,brianv0/sqlalchemy,halfcrazy/sqlalchemy,bootandy/sqlalchemy,robin900/sqlalchemy,Akrog/sqlalchemy,elelianghh/sqlalchemy,j5int/sqlalchemy,bdupharm/sqlalchemy,wfxiang08/sqlalchemy,itkovian/sqlalchemy,WinterNis/sqlalchemy,graingert/sqlalchemy,alex/sqlalchemy,inspirehep/sqlalchemy,zzzeek/sqlalchemy,itkovian/sqlalchemy,wujuguang/sqlalchemy,brianv0/sqlalchemy,monetate/sqlalchemy,olemis/sqlalchemy,EvaSDK/sqlalchemy,davidfraser/sqlalchemy,davidfraser/sqlalchemy,monetate/sqlalchemy,Akrog/sqlalchemy,j5int/sqlalchemy,276361270/sqlalchemy,wujuguang/sqlalchemy,pdufour/sqlalchemy,bootandy/sqlalchemy,WinterNis/sqlalchemy,alex/sqlalchemy,Cito/sqlalchemy,sandan/sqlalchemy,wfxiang08/sqlalchemy,ThiefMaster/sqlalchemy,276361270/sqlalchemy,hsum/sqlalchemy,pdufour/sqlalchemy,dstufft/sqlalchemy,davidjb/sqlalchemy,robin900/sqlalchemy,bdupharm/sqlalchemy,Cito/sqlalchemy,sandan/sqlalchemy,epa/sqlalchemy,epa/sqlalchemy,hsum/sqlalchemy,halfcrazy/sqlalchemy,EvaSDK/sqlalchemy,ThiefMaster/sqlalchemy,graingert/sqlalchemy