Fix typo.

Doc/whatsnew/whatsnew24.tex

@@ -670,7 +670,7 @@ changes to your code:
   relying on the wrong order need to be fixed.
 
 \item \function{fcntl.ioctl} now warns if the mutate arg is omitted
- and relavent.
+ and relevant.
 
 \end{itemize}