Boot-time: update infos about supported LCD cape

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

slides/beaglecam/beaglecam.tex

@@ -8,8 +8,8 @@
 	\item Beagle Bone LCD cape\\
               \url{https://elinux.org/Beagleboard:BeagleBone_LCD4}\\
 	      Unfortunately, no longer manufactured. However, we will
-              make the course work too with this cape from Sparkfun:
-              \url{https://www.sparkfun.com/products/12085}
+              try to make the course work too with this cape Element14:
+              \url{https://tinyurl.com/ncysvahc}
         \item Standard USB webcam (supported through the \code{uvcvideo}
 	      driver.
     \end{itemize}