Update walkthroughs with Rust Embedded videos

Author: keadwen

draft/2022-02-09-this-week-in-rust.md

@@ -28,6 +28,9 @@ If you find any errors in this week's issue, [please submit a PR](https://github
 
 ### Rust Walkthroughs
 
+* [series] [video] [Rust Embedded for STM32 Microcontrollers - Cross-compilation](https://youtu.be/WmEBBoc2iYM)
+* [series] [video] [Rust Embedded for STM32 Microcontrollers - HAL Crates](https://youtu.be/4oJy3ywY2B0)
+
 ### Miscellaneous
 
 ## Crate of the Week