Fix small typos in docstring
Fix small typos in docstring

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