emphasize for missing tutorials

Author: joaorlima

README.md

@@ -275,7 +275,7 @@ It's a great way to learn.
 * [**C++**: _Writing a Bootloader_](http://3zanders.co.uk/2017/10/13/writing-a-bootloader/)
 * [**Rust**: _Writing an OS in Rust_](https://os.phil-opp.com/)
 * [**Rust**: _Add RISC-V Rust Operating System Tutorial_](https://osblog.stephenmarz.com/)
-* [**(any)**: Linux from scratch](https://linuxfromscratch.org/lfs)
+* [**(any)**: _Linux from scratch_](https://linuxfromscratch.org/lfs)
 
 #### Build your own `Physics Engine`
 
@@ -438,7 +438,7 @@ It's a great way to learn.
 * [**JavaScript**: _Build a ride hailing app with React Native_](https://pusher.com/tutorials/ride-hailing-react-native)
 * [**JavaScript**: _Build Your Own AdBlocker in (Literally) 10 Minutes_](https://levelup.gitconnected.com/building-your-own-adblocker-in-literally-10-minutes-1eec093b04cd)
 * [**Kotlin**: _Build Your Own Cache_](https://github.com/kezhenxu94/cache-lite)
-* [**Lua**: Building a CDN from Scratch to Learn about CDN](https://github.com/leandromoreira/cdn-up-and-running)
+* [**Lua**: _Building a CDN from Scratch to Learn about CDN_](https://github.com/leandromoreira/cdn-up-and-running)
 * [**Nim**: _Writing a Redis Protocol Parser_](https://xmonader.github.io/nimdays/day12_resp.html)
 * [**Nim**: _Writing a Build system_](https://xmonader.github.io/nimdays/day11_buildsystem.html)
 * [**Nim**: _Writing a MiniTest Framework_](https://xmonader.github.io/nimdays/day08_minitest.html)