Boot time slides: clarification about the bootchart output

Signed-off-by: Michael Opdenacker <michael.opdenacker@bootlin.com>

slides/boot-time-init-scripts/boot-time-init-scripts.tex

@@ -32,7 +32,7 @@ \section{Optimizing init scripts and system startup}
 	      (\kconfig{CONFIG_BOOTCHARTD=y})
 	\item Boot your board passing \code{init=/sbin/bootchartd} on your
 	      kernel command line
-	\item Copy \code{/var/log/bootlog.tgz} from your target to your host
+	\item Copy the generated \code{/var/log/bootlog.tgz} file from your target to your host
 	\item The last release of Bootchart is from 2007, and is now
 	      broken on \url{http://www.bootchart.org}. Download a copy
 	      from \url{https://bootlin.com/pub/source/bootchart-0.9.tar.bz2}