slides/buildroot-introduction: update to 2021.02

Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>

slides/buildroot-introduction/buildroot-introduction.tex

@@ -7,13 +7,13 @@ \section{Introduction to Buildroot}
   \item {\bf Fast}: builds a simple root filesystem in a few minutes
   \item Easy to understand: written in make, extensive documentation
   \item {\bf Small} root filesystem, starting at 2 MB
-  \item {\bf 2500+ packages} for user space libraries/apps available
+  \item {\bf 2800+ packages} for user space libraries/apps available
   \item {\bf Many architectures} supported
   \item {\bf Well-known technologies}: {\em make} and {\em kconfig}
   \item Vendor neutral
   \item Active community, regular releases
     \begin{itemize}
-    \item The present slides cover {\em Buildroot 2020.02}. There may
+    \item The present slides cover {\em Buildroot 2021.02}. There may
       be some differences if you use older or newer Buildroot versions.
     \end{itemize}
   \item \url{https://buildroot.org}
@@ -91,8 +91,8 @@ \section{Introduction to Buildroot}
     \begin{itemize}
     \item Maintained during one year
     \item Security fixes, bug fixes, build fixes
-    \item Current LTS is release is \code{2020.02}, next one will be
-      \code{2021.02}.
+    \item Current LTS is release is \code{2021.02}, maintained until
+      March-April 2022, next one will be \code{2022.02}.
     \end{itemize}
   \end{itemize}
 \end{frame}