Markdown style fixes

steam.md

@@ -5,27 +5,27 @@
 * Linux Mint 21.2 Cinnamon
 * Steam Version 1696019606
 
-## Installation steps
+## Installation
 
-```
+```shell
 sudo wget -O- http://repo.steampowered.com/steam/archive/stable/steam.gpg | gpg --dearmor | sudo tee /usr/share/keyrings/steam.gpg
 ```
 
-```
+```shell
 echo deb [arch=amd64 signed-by=/usr/share/keyrings/steam.gpg] http://repo.steampowered.com/steam/ stable steam | sudo tee /etc/apt/sources.list.d/steam.list
 ```
 
-```
+```shell
 sudo apt update
 ```
 
-```
+```shell
 sudo apt install -y steam
 ```
 
 ## Removal
 
-```
+```shell
 sudo apt autoremove -y --purge steam
 ```