Boot time: update lab description

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

slides/boot-time-application/boot-time-application.tex

@@ -94,7 +94,7 @@ \section{Optimizing applications}
 \item Compile the video player with just the features needed at run
       time.
 \item Trace and profile the video player with \code{strace}
-\item Observe size savings
+\item Observe size and time savings
 \end{itemize}
 }