Fix some mangled text and bad formatted in ImageOutput docs
Fix some mangled text and bad formatted in ImageOutput docs

YangYangTL/oiio,cwilling/oiio,YangYangTL/oiio,sambler/oiio,lgritz/oiio,cwilling/oiio,mcanthony/oiio,bdeluca/oiio,OpenImageIO/oiio,sambler/oiio,cwilling/oiio,lgritz/oiio,micler/oiio,lgritz/oiio,OpenImageIO/oiio,bdeluca/oiio,cwilling/oiio,mcanthony/oiio,mcanthony/oiio,bdeluca/oiio,mcanthony/oiio,lgritz/oiio,bdeluca/oiio,micler/oiio,scott-wilson/oiio,scott-wilson/oiio,YangYangTL/oiio,OpenImageIO/oiio,OpenImageIO/oiio,YangYangTL/oiio,sambler/oiio,scott-wilson/oiio,scott-wilson/oiio,micler/oiio,sambler/oiio,micler/oiio