[ISSUE]: Outdated installation instructions.

[RoPedro]

OS: Arch Linux;
Installed package: https://archlinux.org/packages/?q=zsh-syntax-highlighting;
Installation method: yay.

When installing the plugin using pacman/yay, it's installed to:
/usr/share/zsh/plugins/zsh-syntax-highlighting/zsh-syntax-highlighting.zsh

instead of:
/usr/share/zsh-syntax-highlighting/zsh-syntax-highlighting.zsh

source command on .zshrc should reflect that.

Steps to reproduce:

1. Install zsh using yay;
2. Install zsh-syntax-highlighting;
3. Check the path which was installed.