guides/installing: add psutil requirement for pyterm

Author: mguetschow

doc/guides/getting-started/installing.mdx

@@ -50,13 +50,13 @@ Depending on the operation distribution you are using, the installation of the r
 #### Ubuntu
 
 ```bash title="Ubuntu command to install required packages"
-    sudo apt install make gcc-multilib python3-serial wget unzip git openocd gdb-multiarch esptool podman-docker clangd clang
+    sudo apt install make gcc-multilib python3-serial python3-psutil wget unzip git openocd gdb-multiarch esptool podman-docker clangd clang
 ```
 
 #### Arch Linux
 
 ```bash title="Arch Linux command to install required packages"
-    sudo pacman -S make gcc-multilib python-pyserial wget unzip git openocd gdb esptool podman-docker clang
+    sudo pacman -S make gcc-multilib python-pyserial python-psutil wget unzip git openocd gdb esptool podman-docker clang
 ```
 
 This will show something like this depending on your distribution: