docs: fix typo (#5134)
docs: fix typo (#5134)


Hzj-jie/koreader,poire-z/koreader,mwoz123/koreader,koreader/koreader,mihailim/koreader,Markismus/koreader,poire-z/koreader,Frenzie/koreader,NiLuJe/koreader,Frenzie/koreader,koreader/koreader,NiLuJe/koreader,pazos/koreader