doc update for $where
doc update for $where

pairyo/nedb,freakynit/nedb,paulovieira/nedb,jedahan/nedb,lukasbestle/newdb,lukasbestle/newdb,jedahan/nedb,nvoron23/nedb,paulovieira/nedb,Ivshti/linvodb3,bitgamma/nedb,pairyo/nedb,lukasbestle/newdb,lseongjoo/nedb,zhangweis/nedb,sguha-work/nedb,Cortys/nedb,Student007/nedb,lseongjoo/nedb,ejok/nedb,Cortys/nedb,sguha-work/nedb,zhangweis/nedb,louischatriot/nedb,Stremio/linvodb3,louischatriot/nedb,Student007/nedb,louischatriot/nedb,nvoron23/nedb,freakynit/nedb,ejok/nedb