fix typo: `compatibiity -> compatibility`

lkmpg.tex

@@ -1585,7 +1585,7 @@ Also, the kernel only allows one instance of any given tasklet to be running at
 In recent kernels, tasklets can be replaced by workqueues, timers, or threaded interrupts.\footnote{The goal of threaded interrupts is to push more of the work to separate threads, so that the minimum needed for acknowledging an interrupt is reduced, and therefore the time spent handling the interrupt (where it can't handle any other interrupts at the same time) is reduced.
 See https://lwn.net/Articles/302043/}
 While the removal of tasklets remains a longer-term goal, the current kernel contains more than a hundred uses of tasklets.
-Now developers are proceeding with the API changes and the macro \cpp|DECLARE_TASKLET_OLD| exists for compatibiity.
+Now developers are proceeding with the API changes and the macro \cpp|DECLARE_TASKLET_OLD| exists for compatibility.
 For further information, see \url{https://lwn.net/Articles/830964/}.
 
 \subsection{Work queues}