debugging: slides: fix priority range for realtime schedulers

Signed-off-by: Luca Ceresoli <[email protected]>

common/scheduling-classes.tex

@@ -30,7 +30,7 @@
 		\item Runnable tasks will preempt any other lower-priority task
 		\item \ksym{SCHED_FIFO}: All tasks with the same priority are scheduled \textbf{First in, First out}
 		\item \ksym{SCHED_RR}: Similar to \ksym{SCHED_FIFO} but with a time-sharing round-robin between tasks with the same priority
-		\item Both \ksym{SCHED_FIFO} and \ksym{SCHED_RR} can be assigned a priority between 0 and 99
+		\item Both \ksym{SCHED_FIFO} and \ksym{SCHED_RR} can be assigned a priority between 1 and 99
 		\item \ksym{SCHED_DEADLINE}: For tasks doing recurrent jobs, extra attributes are attached to a task
 			\begin{itemize}
 				\item A computation time, which represents the time the task needs to complete a job