fix typo in doc
fix typo in doc

Southparkfan/lightncandy,zordius/lightncandy,cgvarela/lightncandy,Southparkfan/lightncandy,jmgq/lightncandy,vein1992/lightncandy,zordius/lightncandy,cgvarela/lightncandy,vein1992/lightncandy,jmgq/lightncandy