- add documentation note for [ticket:1841]
- add documentation note for [ticket:1841]

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