Fix broken links

Author: Disasm

src/02-requirements/README.md

@@ -99,4 +99,4 @@ and "easy to follow"-ness, IMO.
 If you have a different development board and you don't consider yourself a total beginner, you are
 better off starting with the [quickstart] project template.
 
-[quickstart]: https://docs.rs/cortex-m-quickstart
+[quickstart]: https://rust-embedded.github.io/cortex-m-quickstart/cortex_m_quickstart/

src/README.md

@@ -2,7 +2,7 @@
 
 > Discover the world of microcontrollers through [Rust]!
 
-[Rust]: https://www.rust-lang.org/en-US/
+[Rust]: https://www.rust-lang.org/
 
 This book is an introductory course on microcontroller-based embedded systems that uses Rust as the
 teaching language rather than the usual C/C++.