Clarify docs about oiiotool --fit:pad
Clarify docs about oiiotool --fit:pad

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