- fix up query update /delete documentation, make warnings a lot clearer, partial fixes for #3252
- fix up query update /delete documentation, make warnings
a lot clearer, partial fixes for #3252

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