[FE training-materials-updates] Fix syntax issue

[Michael Opdenacker]

Repository : git://git.free-electrons.com/training-materials.git
On branch  : master
Link       : http://git.free-electrons.com/training-materials/commit/?id=26e58f21b5df2c55797887b3e8cbcd37d6e13e6e

>---------------------------------------------------------------

commit 26e58f21b5df2c55797887b3e8cbcd37d6e13e6e
Author: Michael Opdenacker <michael.opdenacker at free-electrons.com>
Date:   Fri May 20 06:54:05 2016 +0200

    Fix syntax issue
    
    Signed-off-by: Michael Opdenacker <michael.opdenacker at free-electrons.com>


>---------------------------------------------------------------

26e58f21b5df2c55797887b3e8cbcd37d6e13e6e
 labs/sysdev-real-time/sysdev-real-time.tex | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/labs/sysdev-real-time/sysdev-real-time.tex b/labs/sysdev-real-time/sysdev-real-time.tex
index 311a58a..7335bb5 100644
--- a/labs/sysdev-real-time/sysdev-real-time.tex
+++ b/labs/sysdev-real-time/sysdev-real-time.tex
@@ -168,7 +168,7 @@ spinlocks).
 Run the simple tests again with this new preemptible kernel and compare
 the results.
 
-\section{Compiling and testing the PREEMPT_RT kernel}
+\section{Compiling and testing the PREEMPT\_RT kernel}
 
 Download the latest \code{PREEMPT_RT} kernel patch and apply it to
 your kernel sources.