Updated doc string for postgresql+pg8000 dialect
Updated doc string for postgresql+pg8000 dialect

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