ReaderTypeset: Minor reword after #7759
ReaderTypeset: Minor reword after #7759

c.f., https://github.com/koreader/koreader/pull/7759#discussion_r638929468

koreader/koreader,NiLuJe/koreader,NiLuJe/koreader,Frenzie/koreader,poire-z/koreader,koreader/koreader,poire-z/koreader,Frenzie/koreader