doc: Highlight the most relevant u-boot talks

The list of u-boot talks on elinux.org is quite long, so let's highlight
the talks which are likely most relevant for newcomers.

Signed-off-by: Paul Barker <paul.barker.ct@bp.renesas.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
diff --git a/doc/learn/talks.rst b/doc/learn/talks.rst
index 33bac48..0bb44ae 100644
--- a/doc/learn/talks.rst
+++ b/doc/learn/talks.rst
@@ -3,9 +3,18 @@
 U-Boot Talks
 ============
 
-U-Boot is a topic at various conferences each year. These talkes might help you
-learn a bit about U-Boot.
+U-Boot is a topic at various conferences each year. These talks might help you
+learn a bit about U-Boot:
+
+* `Tutorial: Introduction to the Embedded Boot Loader U-boot - Behan Webster,
+  Converse in Code <https://www.youtube.com/watch?v=INWghYZH3hI>`__
+  from Embedded Linux Conference 2020
+  (`slides <https://cm.e-ale.org/2020/ELC2020/intro-to-u-boot/intro-to-u-boot-2020.pdf>`__).
+
+* `Recent Advances in U-Boot - Simon Glass, Google Inc.
+  <https://www.youtube.com/watch?v=YlJBsVZJkDI>`__
+  from Embedded Linux Conference 2023.
 
-See elinux_talks_ for a list.
+See elinux_talks_ for a more comprehensive list.
 
 .. _elinux_talks: https://elinux.org/Boot_Loaders#U-Boot