- add a comment regarding why __init__ has a return value
- add a comment regarding why __init__ has a return value

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