Embedded Linux slides: minor ltrace improvement

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

slides/sysdev-application-development/sysdev-application-development.tex

@@ -331,6 +331,8 @@ \subsection{Debuggers}
       breakpoints or change internal variables. You can also use it to
       see what a program was doing when it crashed (by loading its
       memory image, dumped into a core file).
+    \item New alternative: {\em lldb} (\url{https://lldb.llvm.org/})\\
+      from the LLVM project.
     \end{itemize}
     See also \url{https://en.wikipedia.org/wiki/Gdb}
     \column{0.2\textwidth}
@@ -501,7 +503,7 @@ \subsection{System analysis}
   it receives
   \begin{itemize}
   \item Very useful complement to \code{strace}, which shows only system
-    calls.
+    calls. Library calls include system calls too!
   \item Of course, works even if you don't have the sources
   \item Allows to filter library calls with regular expressions, or
     just by a list of function names.