DOC: Fix documentation compilation warnings; improve output formatting
DOC: Fix documentation compilation warnings; improve output formatting

Fix warnings when compiling the docs.
Removes the documentation of the default types, which already gets
included automatically and was wrong because not kept in sync with the
function signature.

Changed, the formatting to the Sphinx formatting.
This looks much better in the compiled documents, but does make the
source a bit harder to read.

DVegaCapital/zipline,CarterBain/AlephNull,bartosh/zipline,zhoulingjun/zipline,ronalcc/zipline,ChinaQuants/zipline,ChinaQuants/zipline,jimgoo/zipline-fork,joequant/zipline,semio/zipline,wubr2000/zipline,stkubr/zipline,florentchandelier/zipline,ronalcc/zipline,zhoulingjun/zipline,umuzungu/zipline,enigmampc/catalyst,chrjxj/zipline,enigmampc/catalyst,dhruvparamhans/zipline,dmitriz/zipline,Scapogo/zipline,alphaBenj/zipline,grundgruen/zipline,euri10/zipline,DVegaCapital/zipline,florentchandelier/zipline,bartosh/zipline,MonoCloud/zipline,jimgoo/zipline-fork,YuepengGuo/zipline,magne-max/zipline-ja,davidastephens/zipline,aajtodd/zipline,alphaBenj/zipline,otmaneJai/Zipline,mattcaldwell/zipline,AlirezaShahabi/zipline,kmather73/zipline,cmorgan/zipline,CDSFinance/zipline,michaeljohnbennett/zipline,StratsOn/zipline,aajtodd/zipline,quantopian/zipline,jordancheah/zipline,kmather73/zipline,magne-max/zipline-ja,humdings/zipline,quantopian/zipline,sketchytechky/zipline,keir-rex/zipline,CDSFinance/zipline,semio/zipline,gwulfs/zipline,iamkingmaker/zipline,Scapogo/zipline,dmitriz/zipline,iamkingmaker/zipline,joequant/zipline,dkushner/zipline,otmaneJai/Zipline,YuepengGuo/zipline,chrjxj/zipline,dhruvparamhans/zipline,wilsonkichoi/zipline,cmorgan/zipline,sketchytechky/zipline,grundgruen/zipline,stkubr/zipline,morrisonwudi/zipline,MonoCloud/zipline,humdings/zipline,wilsonkichoi/zipline,nborggren/zipline,wubr2000/zipline,michaeljohnbennett/zipline,morrisonwudi/zipline,gwulfs/zipline,jordancheah/zipline,keir-rex/zipline,erikness/AlephOne,AlirezaShahabi/zipline,StratsOn/zipline,dkushner/zipline,CarterBain/AlephNull,nborggren/zipline,erikness/AlephOne,umuzungu/zipline,euri10/zipline,davidastephens/zipline,mattcaldwell/zipline