message: docs: Update ArchLinux install command
  It is removing `-yu`, because it updates the system before downloading the package.
  ArchLinux is updated constantly and can crash the system, so it's better just to install the package.
diff: @@ -144,7 +144,7 @@ cargo install bottom
  There is an [official package](https://archlinux.org/packages/community/x86_64/bottom/) that can be installed with `pacman`:
  ```bash
  -sudo pacman -Syu bottom
  +sudo pacman -S bottom
  ```
  ### Debian/Ubuntu
  