Revert "DOC Updated example image."
Revert "DOC Updated example image."

This reverts commit eb3df28a7c90facbd8cc64b392c01859dcc436a6.

quantopian/pyfolio,sketchytechky/pyfolio,YihaoLu/pyfolio,ChinaQuants/pyfolio,yanheven/pyfolio,raybuhr/pyfolio,quantopian/pyfolio,r0k3/pyfolio,dursk/pyfolio,chayapan/pyfolio,ChinaQuants/pyfolio,YihaoLu/pyfolio,femtotrader/pyfolio,dursk/pyfolio,yanheven/pyfolio,r0k3/pyfolio,raybuhr/pyfolio,femtotrader/pyfolio,sketchytechky/pyfolio