\end{describe}
\begin{describe}{gf}{scanner-unread @<scanner> @<character>}
- Rewind the @<scanner> by one step. The @<chararacter> must be the previous
+ Rewind the @<scanner> by one step. The @<character> must be the previous
current character, and becomes the current character again. It is an error
if: the @<scanner> has reached end-of-file; the @<scanner> has never been
stepped; or @<character> was not the previous current character.